not sure where to post this but I hope someone can help me with this hand.

Full Tilt No-Limit Hold'em, $0.25 BB (8 handed) Full-Tilt Converter Tool from FlopTurnRiver.com (Format: FlopTurnRiver)

CO ($9.15)
Button ($7.45)
SB ($39.95)
BB ($8.50)
Hero ($12.50)
UTG+1 ($24.30)
MP1 ($24.25)
MP2 ($17.50)

Preflop: Hero is UTG with A, K.
Hero raises to $0.75, UTG+1 calls $0.75, 1 fold, MP2 calls $0.75, 4 folds.

Flop: ($2.60) 5, A, J (3 players)
Hero bets $2.5, UTG+1 calls $2.50, MP2 folds.

Turn: ($7.60) 2 (2 players)
Hero ????

I hate the 3rd spade. I'm not sure whether to shove, check raise, or check fold to a big bet.

Edit: If I had bought in with 40bb's instead that would make this an easy shove?