Playing Bullets on a Paired Board

[MrDiz]

I'm not sure if I played this hand right or not, so I'll see what you guys would do.

$10 $15k Guaranteed PokerStars No-Limit Hold'em Tourney, Big Blind is t100 (9 handed)

Button (t1558)
SB (t2065)
BB (t3733)
UTG (t1945)
UTG+1 (t6209)
Hero (t2175)
MP2 (t1740)
MP3 (t4800)
CO (t2510)

Preflop: Hero is MP1 with A[img]/images/graemlins/spade.gif[/img], A[img]/images/graemlins/club.gif[/img].
<font color="#666666">2 folds</font>, <font color="#CC3333">Hero raises to t300</font>, <font color="#666666">1 fold</font>, MP3 calls t300, <font color="#666666">1 fold</font>, Button calls t300, <font color="#666666">1 fold</font>, BB calls t200.

Flop: (t1250) J[img]/images/graemlins/club.gif[/img], 5[img]/images/graemlins/heart.gif[/img], J[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(4 players)</font>
BB checks.

What to bet here? (if anything?)