2/5 live: Why do I ever limp reraise w/ AA.

[lucid75]

Game is full of super loose, super fishy LAGs, all business guys with tons of cash. The money in this game means nothing to them. It's my first time in this game and to me all the players seem to fit similar profiles, the only difference is that the two players on my right, and the one on my left seem to be slightly less loose, and more passive preflop. Lot's of reraising going on preflop with pretty light holdings A6 etc. I've built my stack up to around 2500, cutoff who I have history with (he likes to try to outplay me) has like 5k. Super volatile supper laggy.

Preflop
UTG limps.
I limp w/ A [img]/images/graemlins/club.gif[/img]A [img]/images/graemlins/heart.gif[/img].
MP1 limps.
MP2 limps.
cutoff raises to 35.
Blinds/UTG fold.
I raise to 125.
MPs fold.
cutoff calls.

Flop
8 [img]/images/graemlins/heart.gif[/img]Q [img]/images/graemlins/heart.gif[/img]T [img]/images/graemlins/spade.gif[/img]
I bet 200.
He raises to 400.
I flat call.

Turn
T [img]/images/graemlins/club.gif[/img]
I check.
He bets 400.
I call.

River
Q [img]/images/graemlins/spade.gif[/img]
I check.
He bets 500.
I?

Advice on lines? I'll post results later.