Ax hits A from SB ($200NL)

UTG was a 40/10, so I put him on limping with a wide range, and expected that he would be raising most Ax hands. Obviously I know nothing about the OOP-poster, save that he's enough of a donk to post OOP. I thought my A could easily be good on the flop, but didn't want to build the pot too much from early position with multiple players to act. That basically guided my thinking through the hand. Thoughts?

Full Tilt No-Limit Hold'em, $2 BB (8 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: FlopTurnRiver)

UTG+1 ($232.80)
MP1 ($73.10)
MP2 ($37)
CO ($80)
Button ($201.95)
Hero ($200)
BB ($122.65)
UTG ($284)

Preflop: Hero is SB with Ahttp://www.flopturnriver.com/phpBB2/...iles/heart.gif, 3http://www.flopturnriver.com/phpBB2/...miles/club.gif. Hero posts a blind of $2.
1 fold, UTG calls $2, 3 folds, CO checks, 1 fold, Hero (poster) checks.

Flop: ($6) Qhttp://www.flopturnriver.com/phpBB2/...iles/spade.gif, Ahttp://www.flopturnriver.com/phpBB2/...es/diamond.gif, 9http://www.flopturnriver.com/phpBB2/...miles/club.gif (3 players)
Hero checks, UTG bets $6, CO calls $6, Hero calls $6.

Turn: ($24) Ahttp://www.flopturnriver.com/phpBB2/...miles/club.gif (3 players)
Hero checks, UTG checks, CO bets $15, Hero calls $15, UTG folds.

River: ($54) Jhttp://www.flopturnriver.com/phpBB2/...iles/heart.gif (2 players)
Hero checks, CO checks.

Final Pot: $54