Help me fit a 5'4" female

[Trekhawk]

Has any of you with her proportions had experience with a Men's Small frame size, like a Giant or something like that?

While you all have been posting here, I have been doing a bit of reading on the web and I feel pretty comfortable with a 48" seat tube (on a standard geometry), but I am still totally lost on cockpit length.

Im 5'4" have a 30 inseam and ride a 50 Trek 5000 (man bike)
I also have a 48 sloping C50. WSD does not work well for me.