Oh, generally I'm only attracted to caucasian women, and MAYBE a few Arabs and Indians. You see, I find pale skin attractive, which, naturally, can only be found in caucasians. Failing that, the size and shape of the facial features is also very important, which is why Arabs and Indians sometimes make the cut. Since the caucasian race originated in Transcaucasia, the region just north of the Middle East (I think that's where we're from) the Arabs and Indians likely share a certain degree of genetic similarity with caucasians, thus giving them facial features more like caucasians than those of other races. For these reasons, I have never found negroids or other mongoloids attractive.
On the other hand, I'm also extremely picky, and have really only ever found about six or so women attractive, all of them caucasian. For this I am thankful, for it makes having a vow of abstinence considerably easier.