Mike, if you want a professional group to do it, and actual get results quickly send off a request when the site comes back online to the Voice Guild at
http://www.samods.org/ they are the best in the world for Voices, and just give them some background on what you need it to sound like and they will do it for free and get it back as soon as possible. Any maps you've ever played at CampaginCreations with Voice's was done by them...
Nifty. What was the wav file limit in a map again? 64? Can't remember. If so, I don't see why I couldn't (try to) get voices for A&O also. That'd kick ultimate arse.