TT in the BB at level 3

[Sidekick]

Party/Empire $10+$1 SnG.

Table has been fairly typical for a late afternoon (EST) SnG. Loose play, questionable calls, etc.

Villain in this hand hasn't been terribly loose, but definately has been playing too loose for the early stages of a SnG. Has shown quite a bit of aggression with marginal holdings.

I am interested in all comments of course, but specifically I'm wondering if I was too aggressive on this hand against an opponent that I've seen show lots of aggression with marginal holdings.

All comments are greatly appreciated.

Party Poker No-Limit Hold'em Tourney, Big Blind is t50 (8 handed) converter (http://www.selachian.com/tools/bisonconverter/hhconverter.cgi)

UTG (t1085)
UTG+1 (t505)
MP1 (t2125)
MP2 (t1410)
CO (t840)
Button (t920)
SB (t460)
Hero (t655)

Preflop: Hero is BB with T/images/graemlins/diamond.gif, T/images/graemlins/heart.gif.
UTG folds, UTG+1 folds, MP1 calls t50, MP2 folds, CO calls t50, Button calls t50, SB completes, Hero checks.

Flop: (t250) 5/images/graemlins/heart.gif, 9/images/graemlins/heart.gif, 6/images/graemlins/diamond.gif <font color="#0000FF">(5 players)</font>
SB checks, <font color="#CC3333">Hero bets t125</font>, MP1 folds, <font color="#CC3333">CO raises to t350</font>, Button folds, SB folds, <font color="#CC3333">Hero raises to t605 (All-In)</font>, CO calls t255.

Turn: (t1460) J/images/graemlins/club.gif <font color="#0000FF">(2 players, 1 all-in)</font>

River: (t1460) 7/images/graemlins/club.gif <font color="#0000FF">(2 players, 1 all-in)</font>

Final Pot: t1460

[Insty]

You either have to play this as a big pair - big raise preflop. Or as a small pair - no set no bet.

Given you checked the BB and didn't hit your set and you have poor position I'd be prepared to check the flop and let this one go.
Would you have played it preflop if you were UTG?