[MonkeeMan]

Thanks for everyone's responses. I'm starting to refine this in my mind by not just looking at the odds but also the consequences of hitting. Part of the problem is that with some of these longshot hands you can pretty much only figure on seeing the flop to connect.

But it looks like 7.5:1 might be the magic number, so with 3 limpers it'a a SB auto-call.