6.50 turbo PS, what's the move on the river?

[McDirk]

Most interested in the best move on the river. I figure the guy for a flush draw or possibly Ax as he seems pretty donkish. What do you think - better to check the river and hope to snap off a bluff? Bet a smaller amount and hope for call? Fine as is?

PokerStars No-Limit Hold'em Tourney, Big Blind is t20 (9 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: FlopTurnRiver)

MP1 (t1790)
MP2 (t2210)
MP3 (t1080)
CO (t2700)
Button (t240)
SB (t1480)
Hero (t1440)
UTG (t1180)
UTG+1 (t1380)

Preflop: Hero is BB with 9, 2.
[color=#666666]3 folds</font>, MP2 calls t20, [color=#666666]1 fold</font>, CO calls t20, [color=#666666]2 folds</font>, Hero checks.

Flop: (t70) A, 2, 9 [color=#0000FF](3 players)</font>
[color=#CC3333]Hero bets t70</font>, MP2 calls t70, CO folds.

Turn: (t210) 9 [color=#0000FF](2 players)</font>
[color=#CC3333]Hero bets t150</font>, MP2 calls t150.

River: (t510) 7 [color=#0000FF](2 players)</font>
[color=#CC3333]Hero bets t500</font>, MP2 folds.

[b]Final Pot:[/b