For me, it depends.  If she's non-op or doesn't intend on getting SRS, then I would not be interested.  I don't think a non-op transwoman is any less of a woman than a post-op transwoman or ciswoman, but I just couldn't date her, or a cisman for that matter because I could constantly be jealous over the parts they have that I should have been born with.  They could be the best person in the world and a perfect match for me, but my jealousy would ruin the relationship.  If she's post-op, or intents in getting SRS then I would be interested.