$12 FTP playing A3 in SB

[flopton]

I only played 21 hands vs villain, and had once given him a walk from the SB. What would you do here, I didn't want to fold preflop but how would you play it?

Full Tilt Poker
No Limit Holdem Tournament
Blinds: t50/t100
5 players
Converter

Stack sizes:
UTG: t2470
CO: t3965
Button: t1225
Hero: t2250
BB: t3590

Pre-flop: (5 players) Hero is SB with 3[img]/images/graemlins/diamond.gif[/img] A[img]/images/graemlins/club.gif[/img]
3 folds, <font color="#cc0000">Hero raises to t300</font>, BB calls t200 <font color="aaaaaa">(pot was t350)</font>.

Flop: 2[img]/images/graemlins/diamond.gif[/img] 4[img]/images/graemlins/club.gif[/img] 3[img]/images/graemlins/club.gif[/img] (t600, 2 players)
<font color="#cc0000">Hero bets t400</font>, BB calls t400 <font color="aaaaaa">(pot was t1000)</font>.

Turn: 9[img]/images/graemlins/club.gif[/img] (t1400, 2 players)
<font color="#cc0000">Hero ?</font>