Turn Bet Warranted?

[Jeffage]

Playing 20-40 at Taj while waiting for another game. I have A [img]/images/graemlins/spade.gif[/img]8 [img]/images/graemlins/spade.gif[/img] in the BB. Game is absolutely nuts, very loose. 6 people limp, SB limps, I decide to raise and build a big pot. Just what I felt like doing pretty much, checking fine also. So anyway, 8 players to the flop, $320 pot. Flop comes Q-7-4 with one spade. SB checks, I check, EVERYONE CHECKS. Turn is the 6 [img]/images/graemlins/spade.gif[/img] giving me the nut flush draw and the gutshot. Is this a bet when you know you can't possibly take the pot down but have tons of outs if called. Or would you prefer to check? The rest of the hand is interesting too, but I'll save that for later.

Thanks,
Jeff