I am looking for a quality choir voices, with some variety/malleability. I have Reason whose choir voices are a little synthetic sounding. I have OS X.
Anything that is affordable($)? I don't caare if its a VST instrument, Refill, or whatever...just as long as it sounds relatively real. I haven't had any luck finding much.

If you're just looking for oo's and ah's, you might consider doing it yourself, or finidng a friend with a decent voice to do it. I layer my own voice multiple times in different timbers to create a chorus effect. I do soprano and alto voices in falsetto. It sounds pretty good with a little practice and with a little help from an editor. There really aren't any quality chorus samples that don't cost a pretty penny. If you find one, please let me know.

This, of course, is assuming you have the music planned out before hand, and you have the software to mix recorded audio and synth.