A hand that concerns me

[The Legend]

I've posted to the Home Poker forum, but this is my first time posting here, so, what up? This is a hand from my last SNG that concerned me. I want to know how you guys would play it.

Party Poker No-Limit Hold'em Tourney, Big Blind is t15 (10 handed) converter

MP1 (t750)
MP2 (t615)
MP3 (t590)
CO (t760)
Button (t725)
Hero (t785)
BB (t785)
UTG (t800)
UTG+1 (t1420)
UTG+2 (t770)

Preflop: Hero is SB with A[img]/images/graemlins/club.gif[/img], 8[img]/images/graemlins/club.gif[/img].
<font color="#666666">1 fold</font>, UTG+1 calls t15, <font color="#666666">2 folds</font>, MP2 calls t15, MP3 calls t15, <font color="#666666">2 folds</font>, Hero completes, BB checks.

Flop: (t75) 3[img]/images/graemlins/diamond.gif[/img], A[img]/images/graemlins/diamond.gif[/img], 5[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(5 players)</font>
<font color="#CC3333">Hero bets t50</font>, BB folds, UTG+1 folds, MP2 calls t50, MP3 calls t50.

Turn: (t225) T[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(3 players)</font>
<font color="#CC3333">Hero bets t125</font>, MP2 calls t125, MP3 calls t125.

River: (t600) Q[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(3 players)</font>
Hero checks, <font color="#CC3333">MP2 bets t425 (All-In)</font>, MP3 folds, Hero folds.

Final Pot: t1025