I feel like it should be broken down into three individual attributes; Attractiveness, Intelligence, and personality. I believe there needs to be a solid balance of the three for a relationship to actually work out in the long term. Personally, if a chick isn't the prettiest but has an amazing personality it wouldn't work for me, and the same with the other possible combinations, for me personally. If she's not good looking, smart, and a good personality I couldn't imagine anything working in the long term. Like I could do a one night stand with a girl that only had looks, could be friends with a girl who was intelligent, and could be friends with a girl who has an amazing personality but to date and form a serious relationship around there has to be a balance out of all three, with that being said out of the choices I would pick attractiveness and intelligence just because that's a better balance than personality alone, if you can't wake up, roll over, and be happy at what you're looking at that simply won't work, if you can't hold a serious conversation with them that also won't work, and if you don't have similar senses of humor than that also will not work or at least that's how I look at it. Curious to hear what others have to say.