Stars 20+2... very deep... big descision on river... i'm beat, right?

[bholdr]

Very deep in a stars $20, i am third in chips at this point, about 30 players left out of 500. Button is a strong TAG, and is maybe getting a little tired of my blind stealing. my turn play was weak, but i really didn't see any other options.... thoughts?

PokerStars No-Limit Hold'em Tourney, Big Blind is t1600 (7 handed) FTR converter on zerodivide.cx

Hero (t50296)
CO (t30650)
Button (t23346)
SB (t22621)
BB (t41443)
UTG (t41324)
MP1 (t56549)

Preflop: Hero is MP2 with 4[img]/images/graemlins/heart.gif[/img], A[img]/images/graemlins/heart.gif[/img].
<font color="#666666">2 folds</font>, <font color="#CC3333">Hero raises to t4800</font>, <font color="#666666">1 fold</font>, Button calls t4800, <font color="#666666">2 folds</font>.

Flop: (t10050) K[img]/images/graemlins/diamond.gif[/img], 3[img]/images/graemlins/spade.gif[/img], A[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">Hero bets t6400</font>, Button calls t6400.

Turn: (t22850) J[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(2 players)</font>
Hero checks, <font color="#CC3333">Button bets t1600</font>, Hero calls t1600.

River: (t26050) Q[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(2 players)</font>
Hero checks, <font color="#CC3333">Button bets t10471 (All-In)</font>, Hero...