BuddyPress.org

I use a plugin by Boone Gorges called Custom Profile Filters:

http://dev.commons.gc.cuny.edu/2009/06/21/updated-version-02-of-custom-profile-filters-for-buddypress/

Needs some manual configuration in the $social_networking_fields array, but you should be able to do what you need.

Give that a shot.