I don't mean to toot my own horn, but I'd feel remiss if I didn't point you towards the Juggalos thread- breasts and butts without a hint of belly fattening.
http://www.process-productions.com/f...ad.php?t=10512
If yo mean *Just* hipp/butt expansion, I can't think of any that don't add either BE or WG if not both.