Built this today. Worked straight out of the gate. Very very happy with it. Even with my old GTX460 I can now get 60-100fps in Flight Sim X (which is very CPU heavy - unusual for a game).
I've changed my mind on a pre-built and am building my own system instead, that way I actually get the bits I want. Have just ordered the following:
Coolermaster Storm Enforcer case
Coolermaster 650W GX PSU
Asus P8Z77-V motherboard
Intel i5 3570K CPU
16GB Corsair Vengeance CL9 1600MHz RAM
OCZ 120GB SSD
I didn't order an aftermarket cooler for the CPU. For now I'm happy enough to use the stock cooler and run at stock speed. I don't plan to overclock for a while and I'll get a flashier fan then.
I'm going to use my existing GTX460 graphics card out of my current PC, plus a couple of hard drives. Got my birthday coming up at the end of November and will get a new GPU then.
Still going to get a new GPU though later this month.