Yes... a nice set of ta-ta's are great. And even if I see a dozen different sets in a day, damn it... I just can't control the testosterone rush to my eyes!!
However... a nice ass... Now, that is something a little harder to come by. From a Michelangelo masterpiece to a very nice Van Gogh, paint by numbers... I just go weak in the knees, among other places. And the added bonus is that a nice ass is usually accompanied by, at the very least, a decent set of legs. So it's a win, win situation all around if you're a leg man as well.