Top pair, top kicker, nut flush draw, worth the plunge?

[AngelicPenguin]

Game had just started, so I didn't know anything about villain. Any input on any of this hand would be appreciated.

Ultimate Bet No-Limit Hold'em Tourney, Big Blind is t10 (8 handed) converter

BB (t1000)
UTG (t1000)
Hero (t955)
MP1 (t1000)
MP2 (t850)
CO (t975)
Button (t2010)
SB (t2210)

Preflop: Hero is UTG+1 with A[img]/images/graemlins/diamond.gif[/img], K[img]/images/graemlins/diamond.gif[/img].
<font color="#666666">1 fold</font>, <font color="#CC3333">Hero raises to t30</font>, <font color="#666666">1 fold</font>, MP2 calls t30, CO calls t30, <font color="#666666">1 fold</font>, SB calls t25, <font color="#666666">1 fold</font>.

Flop: (t130) 6[img]/images/graemlins/diamond.gif[/img], A[img]/images/graemlins/heart.gif[/img], 3[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(4 players)</font>
SB checks, <font color="#CC3333">Hero bets t130</font>, MP2 folds, CO calls t130, SB calls t130.

Turn: (t520) 4[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(3 players)</font>
SB checks, <font color="#CC3333">Hero bets t300</font>, <font color="#CC3333">CO raies t815(All-in)</font>, SB folds, Hero ???.