Face is paramount, if she's got a beautiful face she's set, she can always improve her body thru working out, she can't improve the face however. A body can be sexy but you fall in love with the face.
I like slim feminine 'girly' girls, not skinny, but slim, medium to large sized breasts, she's gotta have back, but not too much back!
What I don't like is overweight chicks. Problem is, where I live, most girls seem to be on the tubby side, I don't know if it's just western culture or laziness but this is a real turn-off seeing them walking around in their low ride jeans with their bellies flopping over, i mean c'mon, what's the deal with that?!
I mean it doesn't take much to look after yourself, I think it denotes a certain lack of character if you can't.
As a guy, I go to the gym, stay active, and look after myself so why can't my girl?