AA without improvement

[obex]

from 3-5 NL game live
opponent is loose preflop, less so postflop, medium aggressive/passive, big stack, haven't seen any bad
plays, have seen him get very lucky with some loose preflop calls
in and out of position. Seems capable of calling preflop raise with any two cards with position. Max buyin is 600 and he has maybe 1500.

i have ~480, pickup A[img]/images/graemlins/spade.gif[/img] A[img]/images/graemlins/heart.gif[/img] from UTG+1

UTG folds, I raise to 20 (standard table raise, pretty loose table preflop)
2 callers, MP and opponent who is LP.

flop J[img]/images/graemlins/spade.gif[/img] 5[img]/images/graemlins/spade.gif[/img] 3[img]/images/graemlins/heart.gif[/img]. (Pot ~65)
I bet 40. MP folds. opp calls.

Turn is 4[img]/images/graemlins/club.gif[/img]. (Pot about ~145)
I bet 100, he calls.

River is 7[img]/images/graemlins/club.gif[/img] (Pot ~345)

What is your line...
You have about 320 left.