I'll be in Las Vegas at the end of month. I think I've got a threesome lined up with two prominent providers but in case they flake on me----what's a GREAT duo with a proven track record?

Rosey Palms and Palmela Handerson

Here ya go
http://www.eros-lasvegas.com/files/ny-ky4-ky1.htm

http://www.theeroticreview.com/discussion_boards/viewmsg.asp?MessageID=47101&boardID=3&page=4

A number of these girls have reviews together.  All are reputable independents.