5-10--play for the straight flush?

[mosta]

the three players in the hand all have a little over a thousand each.

Qh Ts Th 8h. I open limp in ep. a limper behind on the button and both blinds. table is close to full, maybe 8 players.

3h 6d 9h. I lead $40, button drops, and both blinds stay.

7h. checked to me. background--maybe I'm playing a little nervous, being pretty new to this limit. I've bought in for 60bb on two tables and doubled on both.

I can't put much more money in with Q-high--probably not enough to make a showdown should that be necessary. My first instinct is to bet close to pot size and put no more money in. But then with 2 outs to the straight flush, I decide to check behind and take a shot a breaking the ace-high. is that a bad plan due to the stacks not being all that deep? or is it bad because I'd never get more than a pot sized bet and raise out of him?

river is Jc. sb leads the pot and we both fold.