I have to second your Brittany O'Neil vote. Although she is justly famous for her tits, she has an awesome ass too. If she ever did an anal scene I think I would explode. I would have to add
Patty Plenty too, at least as she was about 10-15 years ago. Watch "
Patty Plenty's Gangbang" from about 1996 and watch as her ass bounces around while 5 guys take turns plowing her up the hershey highway...amazing!!