Have you got that Xeon OC'd?
And what kind of ppd.
I love this new client, it is so much easier to use.
Right now I have my CPU + GPU going with a predicted 24k PPD. I may set my server up too 24/7. Will work out the cost. I can't imagine it will be mega bucks with a C2Q and mid-low end graphics card
I haven't really kept up on the GPU side.
But cost/power draw:
660TI for Kepler, they will eventually get Kepler working right.
560TI for Fermi.
Those 2 would be my guess.
They are also getting closer to having a solution to getting AMD back into the game.