200+15NL Stars Hand

[PlayerA]

Blinds are 75/150. I have about T2900 and am in CO. SB has T2300. I get A [img]/images/graemlins/club.gif[/img] 3 [img]/images/graemlins/club.gif[/img]. I raise to 600 for the steal (fairly tight table). SB calls. The flop is A [img]/images/graemlins/heart.gif[/img] J [img]/images/graemlins/club.gif[/img] T [img]/images/graemlins/club.gif[/img]. Checked to me. I bet something small like T450. SB moves in. What's your move? And, what do you think the SB may have? SB just got to the table so no real read on him yet.