I have basically similar proportions (at least the two that you mention). I recently bought a 53cm Jamie Roy, and it seems a bit long for my short torso, at least compared to my other rides. It's still a good ride, just bigger than what I'm used to. A shorter stem and narrower bars would help.

If you are planning on doing the BF group buy (mark V geometry), I would recommend the 53, especially since it has a shorter TT than the Jamie Roy of the same nominal size. That's what I'm gonna do.

note: I'm not a girl, I just wear girls pants.

what?