Definitely T'Pol. I'd get on with a vulcan much better and i don't actually find seven to be very attractive at all besides.
Looking at the picture of the actress that plays T'pol and i find her repulsive though. IF she wants to come round my house she'd better be getting that vulcan stuff on.
That's for the original question, for the larger star trek universe i do quite like jadzia dax and ensign Ro.
Saw this which helped me decide.