In my opinion, you should try getting your own recordings, since everyone that have tried Vocal Planet will probably recognize the samples you use, and other people will more than likely include them in their own songs.
I was _really_ disappointed the first time I heard the entire latino-trumpet part in “My head feels like a frisbee” in a sampleset called “Latin World”, because I truly believed that Simon had travelled the world for “Tales of the inexpressible”. But of course, it’s a matter of taste, though I still think that a track gains more of its own integrity by using unique samples.
Another option is to manipulate them so they are not easy recognizable, that way you obtain your own sound and stil benefit from the organic parts of vocal samples
But you could take a look at Zero-G’s Vocal Forge, it’s not typical ethnic, tho.