Big pot out of position with TPTK-- any other way to play it?

[Ghazban]

Everyone in the hand is unremarkable statistically; perhaps a little on the tight side preflop so I doubt they're calling my UTG raise with trash. I don't rule out a flush draw for the later callers (MP3 and BB) as they're looking at a multiway pot with fairly deep stacks.

Party Poker No-Limit Hold'em, $2 BB (10 handed) converter

MP1 ($181.9)
MP2 ($157.15)
MP3 ($513.1)
CO ($203.95)
Button ($223.95)
SB ($351.7)
BB ($181)
Hero ($227.75)
UTG+1 ($60.75)
UTG+2 ($364.45)

Preflop: Hero is UTG with K[img]/images/graemlins/heart.gif[/img], A[img]/images/graemlins/spade.gif[/img]. SB posts a blind of $1.
<font color="#CC3333">Hero raises to $6</font>, <font color="#666666">1 fold</font>, UTG+2 calls $6, <font color="#666666">2 folds</font>, MP3 calls $6, <font color="#666666">3 folds</font>, BB calls $4.

Flop: ($25) 7[img]/images/graemlins/club.gif[/img], A[img]/images/graemlins/diamond.gif[/img], 4[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(4 players)</font>
BB checks, <font color="#CC3333">Hero bets $20</font>, UTG+2 calls $20, MP3 calls $20, BB folds.

Turn: ($85) J[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(3 players)</font>
<font color="#CC3333">Hero bets $50</font>, UTG+2 folds, MP3 calls $50.

River: ($185) 3[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(2 players)</font>
Hero checks


On the end, I'm prepared to call a reasonable bet. If he puts me all in, I'm not sure what I'll do (it'll be about 3/4 pot)-- it'll depend on my read on his bet timing and gut feeling.