I've read several things on this site and others about the 6400 vs the 6500. If I'm not mistaken, it comes down to 2million to 1 contrast for the 6400 and 5million to 1 contrast for the 6500. My question is does that make a difference? I can essentially get them both for the same price when you include tax from a local store versus no tax if buying online. Will I notice a difference between the two? Is it worth the wait/shipping time to get the 6500 online? Any and all help is greatly appreciated.