That's one thing I'd love in my woman - wit. Seriously, someone who could match wits with me would make life so interesting. An open mind would be good too, for the same reasons.
On a more specific note, an interest in the same kinds of music would be good, as would the ability to play an instrument.
Failing that, she could just learn to play my instrument! HURR :B
I have no real hair or eye colour preference, but her hair should be about shoulder-length. In terms of build she shouldn't be too fat, but not super-skinny either. Average is best. With great legs.