[sharpie]

I think villain is never folding a better hand here, but I also think you have the best hand often, and if not some outs to fall back on.

If he has red KQ he has 3 outs, so checking isn't bad here. If he has K[img]/images/graemlins/spade.gif[/img]Q I expect him to bluff the turn. Also if he has A[img]/images/graemlins/spade.gif[/img]x I would expect him to bluff the turn, and if he has Ax no spade he has very few outs.

A benefit I can see to betting the turn is folding out something like red AQ that would take half the pot if you don't catch a spade.

If you check/call the turn you'll probably feel obliged to check/call the river, so you're not really saving anything over bet/calling the turn and folding the river UI.

Overall I prefer betting the turn.