[Acehawk74]

As cookie cutter as this sounds, it depends.

I would think an ideal straight flush to chase would be an A2345, but you would more so approach the hand from the nut flush perspective. In this case, assuming youre holding something like A3s in the BB, and the flop comes 2 5 x with 2 and 5 being the same suit as your hand.. you would have 8 outs to the nut flush, and 1 out to the stone cold nuts, as well as 3 outs to a straight. So basically, all other considerations aside, you're looking at 12 outs. So.. as long as the pot is laying you the breakeven point or better, you can call. Question then turns to pot equity.. and this is situational. Should you bet/raise etc.. thats a further topic. Someone correct me if im off here, its early in the morning for me [img]/images/graemlins/cool.gif[/img]

Oh, as it pertains to open-ended or gutshot str/flush draw, take a 23s with 45x on the board with 4 and 5 the same suit as your hand.

7 outs to a flush
2 outs to a straight flush
6 outs to a straight

so this would increase your outs to 15. At this point as before, the difference would be more shown in your pot equity, I would think folding here wouldn't be much of an option.