I'm trying to play a slightly more aggressive game, and I'm trying to figure out how to do it correctly. Any suggestions on this hand?
Should I had just folded this hand pre-flop since I have about 56BB?
What about calling the re-raise?
What if I had pushed at his river check...any good?

My only note was that he's been sLAG since the tourney started.

Full Tilt Poker
No Limit Holdem Tournament
Blinds: t20/t40
8 players

Stack sizes:
UTG: t1400
UTG+1: t2580
MP1: t1235
MP2: t225
Im_new: t2550
Button: t920
SB: t1995
BB: t2595

Pre-flop: (8 players) Im_new is CO with A 9
4 folds, Im_new raises to t120, 2 folds, BB calls t80 (pot was t180).

Flop: 5 4 A (t260, 2 players)
BB checks, Im_new bets t180, BB calls t180 (pot was t440).

Turn: K (t620, 2 players)
BB checks, Im_new bets t400, BB raises to t800, Im_new calls t400 (pot was t1820).

River: 8 (t2220, 2 players)
BB checks, Im_new checks.

Results:
Final pot: t2220