What everybody said.

The only program that I know of that will allow you to tweak and reduce the poly count without trashing the uvs is Silo and it's not free ;). That and I have no idea how good a  job it does with that. Everything else that I'm aware of will destroy the uvs. And even if done in Silo, any morphs would not work as pjz99 has pointed out.

Laurie