[Tilt]

I hate this situation.

I think leading the turn is best. If you don't lead the turn and its checked through to a river spade, you'll be in a world of hurt. Also a weak straight here may fold on the turn, but if you check he may bet or call you on the river.

If you are raised on the turn I think you need to wind up all-in. Your odds will be close with these stack sizes against a straight, plus there is a decent chance that you are up against a badly played underset by these passive opponents (or underset + flush draw).

If you just get called and don't fill up, its going to be a tough play at the river.