TPTK early in MTT vs LAG

$300 220 player live MTT, start with T5,000. 2nd round, blinds T50/100.

Hero is UTG+1, image is weak/tight, stack = T4,500.
Villain is SB, hyper-aggressive, overbets frequently, stack = T9,000.

Preflop (full table, pot = T150)
UTG folds to hero, picks up A [img]/images/graemlins/club.gif[/img] 7 [img]/images/graemlins/club.gif[/img]. Hero raises to T300.
Table folds to SB who calls, BB folds.

Flop (T750):
7 [img]/images/graemlins/spade.gif[/img] 6 [img]/images/graemlins/diamond.gif[/img] 2 [img]/images/graemlins/club.gif[/img]

After asking how many chips hero has left, villain goes all in. Hero?