What's the cheapest Car Headunit with Iphone streaming via bluetooth?

I want to swap it out with the one in my 96' neon. It has to be able to support subs, and i would like the headunit to let the iphone control the music, not the the headunit control the music.

Www.Crutchfield.com

Crutchfield is good for finding out what fits, and seeing all of the options a particular radio has, but don't buy from there. Amazon and other vendors are almost always cheaper.