Not a girl here, but aren't looks and personality two sides of the same coin? It's not like when someone has one or the other you can choose which you want to live with, you have to live with both.
I don't see how anyone could go for either the one or the other, they seem too intertwined as such. While you can't admit it nowadays without being labelled shallow, looks matter to a certain degree. People like pretty people (and that's perfectly okay). However, that isn't something you want to soley base your relationship on. You'll also have to be able like- or at very least tolerate, his/her behaviour.
Good personality might give you a better tolerance for less than perfect looks, and vice versa, but when it comes down to it you really can't exclude one or the other.