Apple usually makes me regret my new purchases after a new rev but this time the $1500 price difference makes my Quad purchase months back easy to handle. Especially since I can go out and upgrade to the 2xQuad core CPUs with my current Mac Pro at a later time when they are less expensive.
I wonder how the 8-core price compares to other workstations, I know the quad was/is very competitively priced for what’s built in.