Have you checked the character packs?
They are not too expensive for what you get, thing is - even if someone did fully comit to making models for you, they won't be nearly as good as the sold media here. The best modellers either have their own projects or sell media through packs and the TGC store.
Check the character pack especially - 5 or so packs, lots of scenery and characters, and it's damn cheap:
http://www.fpscreator.com/characterpack.html
I guess my point is that you could spend a little money, and have the sort of media that would take a very long time for even a dedicated artist to make, plus again - the quality would be much better. Once the project takes off it's always easier to find help.