Sorry, can I also butt in here? Please, Nero?
Okay, while I'm waiting for your answer, I'll just go ahead and add my couple cents.

luv ya!
I identify as MtF and still very early on (pre-HRT, pre-OP) and I have always been physically attracted to women (GGs) and have, until recently, only considered dating GGs - albeit very, very unsuccessfully. Now, I am at a point where I'm really not interested in dating anyone, mostly because, like Jaimie, I'm more afraid of hurting someone else than myself. I have never thought of, or considered dating a guy a remote possibility.
Having said that, I think the only thing that could change my mind is if I met an MtF, Androgyne, or even an FtM who I really liked, I very well could change my mind. I think I would feel that someone else who is TG/TS would be more understanding of what I am going through and could grow along with. That and I have seen quite a few really hot women. As for FtM, I think I could probably make some exceptions to my no interest in males. Now, once I'm post-op, I could likely see myself easily being open to being with a guy (GM or FtM) probably more likely FtM than GM. I would even be open to Androgyne - I have known a few over the years and they have pretty universally been super nice peeps. I guess it all comes down to, like many have said, what is on the inside, if there is chemistry. Looks do count a lot to me, but you could look stunning (I'm more attracted to a MaryAnne type over Ginger) but if you don't have a personality or can't hold my interest, then looks are nothing.
I hope I made some kind of sense here (I'm getting tired).
Deanna