I've got a bit of both,
but most of my "guy clothes" are a little androgynous. I was into punk and gothic fashion before I decided to transition, and both styles encourage a sort of in-between look, so a lot of my male wardrobe was bought/made with the intention of looking a little feminine.
After transitioning, I'm thinking I'll want to do basically the same thing, but in reverse--wearing "girl clothes" that look a bit masculine (think chains and spikes and stuff). So I'm planning to just slowly phase out my old stuff with new stuff that's a little more feminine and form-fitting.
A few fancy dresses would be cool too, but I think I'll wait till my body's done shaping itself for that. I'd be heartbroken if I found the perfect dress and only had a chance to wear it once or twice before it stopped fitting.