Was I wrong to slow play this?

[Gandor]

Party $10 NL SNG 5 players left. Level 4

UTG T4230
MP T520
Button T1210
SB T945
Hero T1095

I'm dealt A [img]/images/graemlins/club.gif[/img] 2 [img]/images/graemlins/diamond.gif[/img]
SB completes and I check.

Flop: 2 [img]/images/graemlins/club.gif[/img] A [img]/images/graemlins/diamond.gif[/img] 7 [img]/images/graemlins/heart.gif[/img]
SB bets T100, I call.

Turn: J [img]/images/graemlins/heart.gif[/img]
check, check

River: 4 [img]/images/graemlins/diamond.gif[/img]

I had been playing 2 tournaments, so my reads weren't the greatest, but the chip leader on my immediate left was very aggressive, having came over the top of me twice already and was quite willing to use his stack to push everyone around. Although winning the pot on the turn would have moved me into 2nd place, I wanted more of a cushion with the big stack aggressive player following me. My feeling was that with the turn check, I would probably get SB to bet the river.

Needless to say, SB held A [img]/images/graemlins/heart.gif[/img] 4 [img]/images/graemlins/club.gif[/img] and I called his all-in. Do you go ahead and raise the flop and try to take this down then, lead out the turn, or gamble and try to take this guy for everything you can? What's the chances of this guy laying down on the turn?

Thanks.
Gandor