AK turn decision

SB in this hand is a solid tag who could very well be 2p2
BB in this hand is a loose donkey
The CO here is 21/7/1.5 or so

Hero is in MP with A[img]/images/graemlins/diamond.gif[/img] K[img]/images/graemlins/club.gif[/img]

PREFLOP:
Folds to Hero, Hero raises, CO calls, folds to SB, SB calls, BB calls.

FLOP: 6[img]/images/graemlins/club.gif[/img], 6[img]/images/graemlins/diamond.gif[/img], T[img]/images/graemlins/spade.gif[/img] (8 SB)
SB checks, BB checks, Hero bets, CO calls, SB raises, BB folds, Hero calls, CO calls.

TURN: Q[img]/images/graemlins/heart.gif[/img] (7 BB)
SB bets, Hero....?