Which proves his point. The Xeon is wasted in this Mac Pro. For the previous versions of the Mac Pro it made sense to use Xeon's for ease of build. Now there is no reason to do so. Apart from using more expensive and RAM and charging people more.
Looks like a nice machine and i'm sure would be a great improvement if I were to buy one over my 08 model.
Intel's i7 chip doesn't support ECC ram so right there you have a reason to have a Xeon in there. You know the reason why for the more expensive RAM, and you know the other processors don't support it. I don't understand why you're saying no reason when you plainly already get at least one reason. ^_^