If we're talking about everything down to physical attributes, appearance and whatnot, then probably not. But if we're just going by personality, interests and the non-physical qualities, then I probably would.
There's a bit of irony here, as over the years I've sort of put together the qualities of my ideal woman, originally for online (and anonymous) role-playing games where I would actually play out her personality, partly for experiment (I wanted to see if female characters were treated differently than male characters.) Eventually, parts of the personality I created for someone else became part of my own. Each virtual incarnation has been different than the previous one, as far as description/appearance, but the personality has been constant, and developing further with each. Until recently I never settled on a physical appearance simply because it didn't matter or didn't appeal to me, but now I have a mental picture to go along with the ideal personality that's developed over the years.
So in a sense, there is at least the idea of a female version of myself, and were she real and not just a product of my imagination, then I would most certainly date her.
I'd also like to point out that I only role-play female characters in appropriate settings, and never pretend to be one outside of the specific media or while out of character.