I've got Protophile's kit in the wife's car. Got it for $99 shipped.
I have Apexcone's setup I paid $130 shipped on my car(Wish I woulda just gone with Protophile's kits, but he wasn't selling at the time)
So far, i have no complaints on either setup. Both perform spot on.
One thing though, and that Gary's (Protophile)'s customer service. It hands down is the best I've ever delt with
Don't cheap out to save $30 and get a kit off Ebay, as stated before, try getting an Ebay seller to warranty your stuff. Ain't gonna happen
Gary sells his kits with lifetime warranty and he stands by it. Worth every penny in my book