It's hard to find what I find attractive in a girl, cause in the end it's all about the package, a girl can have a perfect 10 body, but an unattractive face and I lose all interest, or vice versa.
In essence the varying parts need to fit together, a girl shouldn't have huge tits and no hips, etc. Personally I have little toleration for boob jobs, cause small breasts are just as awesome as large ones, and I pity the insecurity that would lead a girl to think getting bigger boobs will improve anything.
That said, I am particularly partial to red hair, green eyes, and the pale lightly freckled skin that tends to accompany those features naturally. But I've found girls of almost every ethnicity, hair color and build, that had me drooling. So once again... all about the total package.