Trick Arrow :P (not kidding here)
@Shift
Shift 50 DM/DA Scrapper ][ TTL 50 Kat/Reg Scrapper ][ Shabriel 50 Peacebringer ][ Ion Shift 46 Rad/Rad Corruptor ][ Thermal Shift 35 Fire/Fire Blaster
"A Scrapper is a lot like a chainsaw. Somewhat hard to handle, incredibly dangerous, and by far the most fun when wielded by the slightly insane."
Poison probably...
I'll propably end up making one with each secondary.
Was going to go /dark, but I'm going to go with poison for a change 
Having got mt test char to 24 and played 2 versions at the event I'm going poison,probably with 2 chars may be with slight differences between them.Silver Spirit's thug MM will be Trick Arrows and again having seen it at lvl40 it does work really well
What I would say is I do think that taking medicine to get stimulant and Aid self would be well worth while if you intend to do any PvP.
As I already have a /Dark, and don't really like many of the other secondaries, if I do another MM I'd probably go Thugs/Poison. The L38 /Poison power looks like it would be quite tasty on the 3rd tier "bruiser" melee pet, and the poison heal should be handy as he won't be near the 5 ranged pets (though the /Dark heal should work great for the ranged pets, as it does with Robots if you keep them together, and probably Mercs too).
TA here too. Got it on my Controller and it's a h00t. And with the love it's gettin in the update which cannot b named, it'll b even tastier. I just think it'll keep me busier and more entertainer than one of the "buffer" secondaries.
Shnyet AWAY
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As I already have a /Dark, and don't really like many of the other secondaries, if I do another MM I'd probably go Thugs/Poison. The L38 /Poison power looks like it would be quite tasty on the 3rd tier "bruiser" melee pet, and the poison heal should be handy as he won't be near the 5 ranged pets (though the /Dark heal should work great for the ranged pets, as it does with Robots if you keep them together, and probably Mercs too).
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Noxious gas(lvl 38 posion power) is a bit crappy for a lvl 38 power, a waste of a pet, doesn't last long and has a murderous recharge on it, avoid it.
And as for my choice of secondary, I'd go for dark. You can get a maximum of 17 pets *drools*
I went for Traps (with some medicine powers) - its great fun & good change of gamestyle from my Poison MM although i have to admit, i've had some nasty faceplants here and there, thugs get owned on regular basis but it still rocks 
Change of plan in typical Kal style....went Trick Arrow for that 'Dukes of Hazzard' feel!
Kallateral Damage lives at last!
Dirty Diamond Thugs/Poison
"Well, they found my diary today.
They were appropriately appalled
at the discovery of the eight victims
They're now putting it all together.
Women wrapped in silk
with one leg missing
Eight legs, one body, silk,
spider, brilliant!"
went for traps - but it was more of a motif than a power thing - hope I'm not turning into a roleplayer!! lol
Went for Dark Miasma, my Thug MM is called Thieving Pikey so I thought of the DM being a kind of Gypsy curse 
If you going to make a Thugs MM on live what you going to takes a secondary!? I'll prolly go Dark.