Looking for Good IVR System to Work with Google Voice

Just as the title says. I'm wanting to find at least a decent Interactive Voice Recognition system that google voice will best work with. Preferably free or cheap, but I understand that such a thing isn't likely(Doesn't mean it hurts to ask lol ) and if this is one of those cases where you get what you pay for. So I'm willing to pay more money for it if need be when it comes to being realistic.

So wait, so why do you need a IVR system? And what sort of a system do you need?

Do you want number-pads, natural language processing? What do you need? You need to be a little more specific.

EDIT: Try here for a comparison (not my site).

Of course, my apologies. When I talk about an IVR system, I'm referring to the menu that most companies provide to calling customers that allow them to either choose options and input requested information based on the number-pad or allow these customers to do the same thing over simple voice. Preferably both.

And thanks for the link. I'll give it a good look-over.