Mind/Kin or Mind/Storm, maybe Fire/kin (I haven#t played one of these since containment came in, so this one is pure speculation).
really, since containment all controllers have been able to solo better. Since mind (I believe) does slightly more damage to compensate for the lack of a pet, it benefits more.
EDIT: gets ready for Grav/ etc. to tear him a new one. I have never played Grav ... or earth, or Ice) so I can't comment on them for soloing purposes...
Synaesthetix:if your mum wasn't already dead I would go kill her for bringing
you into the world
Mind also has Mass Hypnosis. In a solo situation, you can fire it off without worrying about people using AoE's to wake the mobs up.
Past 32, Fire/Rad for the win!
Easy Peasy 
I'd say Illusion has a big advantage for soloing in the mid-game because it gets Phantom Army at 18.
CoX 50s: <ill/rad> <ice/ice> <fire/kin> <grav/sonic> <ice/storm> <earth/kin> <kin/elec> <cold/psy> <thugs/dark> <fire/dark> <dark/elec> <night widow> <EM/ninj> <mind/icy>
Fire/Rad or /Kin
Rad is the safest bet, but Kin will make you move faster with more damage, faster recharge and all the endurance you'd want.
/Kin is a late bloomer where /Rad more or less is useful from the start.
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Past 32, Fire/Rad for the win!
Easy Peasy
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Past 38, Fire/Kin for the win!
Easy Peasy
fixed that up for you 
Synaesthetix:if your mum wasn't already dead I would go kill her for bringing
you into the world
I find Illusion/TA very effective solo at all levels.
I really should do something about this signature.
i'd say as primary: fire, ill and grav with secondary either kin or rad, though my ill/ff wasnt that hard to solo at times (even when i built him as a teambuild). Mind is also soloable, yet I dont know for sure what the best secondary is for mind.. i never really got into mind
Ice and earth are definately not viable to solo compared to the other primaries
"god, how many devs did hami have to sleep with to get ED?"
Total Cat @Stagefright
Any Illu or Fire combo will do, best if it's Illu/rad or storm, or Fire/kins or ff
in pve in terms of doing dmg and looking after yourself its fire/kin all the way
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EDIT: gets ready for Grav/ etc. to tear him a new one. I have never played Grav ... or earth, or Ice) so I can't comment on them for soloing purposes...
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ROFL!! Am Grav/Rad here, don't bother trying to solo it until it gets over 40 with the epics. The holds do little damage and Propel whilst it's cool and does some good damage, takes too long to fire and then recharge to be any use. You might be able to do it with some of the fighting power pools but that defeats the exercise really.
And I'm sure someone will come and say that they have solo'd a grav/rad troller all the way from -199 to infinity, and I'm sure you could do it .... but how many hours did it take, i'm sure you could also solo all the way to 50 using only Brawl, but would you want to?
Having now knocked my build to bits .... on a team grav/rad is great fun to play, not nearly as spectacular as some of the others as the animations are subtle, but effective.
I also play a grav/rad troller (lvl 32), and I don't have any problems soloing if I want to. While I would rather team up, I find I can go it alone when I have to. Even pre-pet, it wasn't bad.
It might not be the best power combo to solo, but you certainly can. I imagine that fire/kin is probably the fastest one to solo due to the damage output. Depends on your patience and playstyle at the end of the day. 
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ROFL!! Am Grav/Rad here, don't bother trying to solo it until it gets over 40 with the epics.
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I know my gf solos on Invincible quite happily (and quite quickly) with her Grav/FF, only having any trouble against mobs with extra mez-protection.
@Synaesthetix
"Here, take some more bees with you. You may need them."
Union: FU//LoUD
"that Syn is that that" - Mothers Love
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ROFL!! Am Grav/Rad here, don't bother trying to solo it until it gets over 40 with the epics.
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I know my gf solos on Invincible quite happily (and quite quickly) with her Grav/FF, only having any trouble against mobs with extra mez-protection.
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[Particularly nasty string of profanity here] boss-class Night Widows.
Other than those though, yes, my Grav/FF has been soloing on Invincible since her 20s, quite comfortably. It's not as fast as Illusion or Mind, and I'd assume fire although I've never played it... but it's certainly not mind-numbingly slow.
Possibly worth noting, I forgot Propel altogether (picked it up at 35 but still don't have it slotted yet) and have Lift and my single-target immob slotted up for damage. I also have my Singularity slotted 3 hold/3 damage, but did fine before I had him. I'd imagine Grav/Rad could be a faster soloer if built the same way mine is, given the -res in Enervating Field.
If nothing else, it's certainly very safe soloing a Grav/FF, I find.
Easy Ill/Rad
Even did invinc with my blaster in I4 but Ill/Rad is by far the easiest to solo.
Good damage, good ability to tank after only level 18 and rad complements it the best as it has mostly debuffs instead of buffs.
Gorgog
P.S. Always thought it was common knowledge Ill/Rad was easy mode .
I'd go with the majority here. Illusion/Fire + Rad for a powerful early / mid build. You can spend your teens cleaning out masses of mobs in Boomtown and the like. With Fire I'd be harvesting masses of Blue/Green minions, with Illusion maybe avoid Hazard Zones and take on smaller groups of Yellows/Oranges, esp Lieuts and bosses.
Post 38 Kinetics is the Damage king, but you've to get to 38 first . Also as I've said before soloing kinetics seems like such a waste thanks to Speed Boosts. The SB love really should be spread around.
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I'd go with the majority here. Illusion/Fire + Rad for a powerful early / mid build. You can spend your teens cleaning out masses of mobs in Boomtown and the like. With Fire I'd be harvesting masses of Blue/Green minions, with Illusion maybe avoid Hazard Zones and take on smaller groups of Yellows/Oranges, esp Lieuts and bosses.
Post 38 Kinetics is the Damage king, but you've to get to 38 first . Also as I've said before soloing kinetics seems like such a waste thanks to Speed Boosts. The SB love really should be spread around.
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when soloing with my fire/kin my imps love the SB
Hmm, interesting thread...
Is there a lack of love for the Ice or Earth sets? I'm playing an Ice/Kin controller, and at level 24 am quite easily soloing on Invincible, although due to other reasons I haven't taken Stamina, so there is the odd minute of downtime now and then. A friend who made an Earth/Kin also solos happily, we had originally planned to team with each other to 50 (along with her bf who made a Fire/Rad to join us) but she's levelling an alt right now, so I'm just out and about.
Actually, I think I have a pair of Ice/Kins (16, 24), a Fire/Rad (6), and a Ill/Emp (50). The 50 was an accident, so I don't really count him, and the Fire/Rad I'm hoping to build into a bit of a stalker hunter (eventually), and is a lower priority.
Shrug.
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Hmm, interesting thread...
Is there a lack of love for the Ice or Earth sets? I'm playing an Ice/Kin controller, and at level 24 am quite easily soloing on Invincible, although due to other reasons I haven't taken Stamina, so there is the odd minute of downtime now and then. A friend who made an Earth/Kin also solos happily, we had originally planned to team with each other to 50 (along with her bf who made a Fire/Rad to join us) but she's levelling an alt right now, so I'm just out and about.
Actually, I think I have a pair of Ice/Kins (16, 24), a Fire/Rad (6), and a Ill/Emp (50). The 50 was an accident, so I don't really count him, and the Fire/Rad I'm hoping to build into a bit of a stalker hunter (eventually), and is a lower priority.
Shrug.
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i love the ice and earth sets however this thread is on solo trollers and for solo mind, illusion and fire are a lot faster to rip though enemies, earth and ice are awesome sets but only really shine in teams imo
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I'd go with the majority here. Illusion/Fire + Rad for a powerful early / mid build. You can spend your teens cleaning out masses of mobs in Boomtown and the like. With Fire I'd be harvesting masses of Blue/Green minions, with Illusion maybe avoid Hazard Zones and take on smaller groups of Yellows/Oranges, esp Lieuts and bosses.
Post 38 Kinetics is the Damage king, but you've to get to 38 first . Also as I've said before soloing kinetics seems like such a waste thanks to Speed Boosts. The SB love really should be spread around.
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when soloing with my fire/kin my imps love the SB
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Hell yeah. But its such a great power you should be sharing with the world!! Everyone! In a mad drive-by spree of Speed Boosts! Imps & Teamies and fellow heroes and their pets onlookers and drones and pedestrians and mobs.... Erm, better not mobs actually
me and my mate have had the idea to make a fire/kin troller and a fire/fire blaster and to group em. The idea is basically i immob/hold/disorient them and he casts all his AofE's when they cant run away. any idea if this will work? thnx
Im not really fire/x blaster fan, since it lacks build up, but any troller is a godsent companion for a blaster IMO
Erm, fire/x only lacks build up when you take devices as secondary... Fire is just a blaster primary as any other with its own qualities and deficiencies.
fire/x wud have aim as is a primary....
fire/fire blasters go very well with an empath
I really like controllers but find it quite difficult to geta team nowadays. I was wondering which were the best sets for a troller that can primerily team but also solo when i cant find one?
thanks