I vote for Grav / Storm. No massive reason why but I've played both as Controller secondaries all the way up to 37 and Storm is more fun IMO. I'm still playing Carni, my Illusion / Storm at 46, and I abandoned my Fire / Rad at 37 for the mo because he's too formulaic.
Rad is more powerful and probably better for soloing too but Storm is just FUN FUN FUN!
Plus you'll get do do the Propel & Hurricane combo, whisking up the stuff you propel and whirling it around and around.
Ty for feedback. I'll give it a try then. What travel power you went for?
@False Fiction - Virtue / Defiant
Current projects - [Glaciologist - Ill/Cold Troller] [Cloudshaper - Storm/Dark Def] [Harald Wartooth - Elec/Psi Domi]
super speed is the best travelpower for a /storm imo....easier to manage the hurricane then.
Personally always try to get leaping aswell though for vertical movement and KB protection.
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I went for TP but that was partially concept for the character too. But TP & Hurricane is great fun, you can switch the point of repulsion instantly by TPing from place to place. Hoverless TP can be annoying when lag kicks in though.
On the city section maps you can open up on the mob with Snow Storm, Freezing Rain and whatever else, then TP to the other side of them to counter knockback and push them into the grinder that is your teammates in the Freezing Rain patch. I find this especially useful for dealing with the knockback of my noob Phantasms attacks.
My grav /Storm has Super speed for Hasten, I have a thread on the boards saying how much I love this build and I still do. If you want any help later with powers contact me.
DD
All sugestions are welcomed mate 
I'm going for SS aswell. Maybe later on I'll get fly just for concept. Cheers
@False Fiction - Virtue / Defiant
Current projects - [Glaciologist - Ill/Cold Troller] [Cloudshaper - Storm/Dark Def] [Harald Wartooth - Elec/Psi Domi]
Not much to say. I'm going for a Gravity troller. Just can't decide between Storm or Rad. Rad would probably make things easier and get me into a team quite often but Storm seems to be fun and have some nice tricks on it. Any suggestions? Cheers
@False Fiction - Virtue / Defiant
Current projects - [Glaciologist - Ill/Cold Troller] [Cloudshaper - Storm/Dark Def] [Harald Wartooth - Elec/Psi Domi]