Looks great. Prebuilt?
The only quibble I have is the Windows 7 Professional. What are you planning on doing that you couldn't do in Home Premium?
And, although this is my opinion, I think 9GB is a bit overkill. I applaud the use of triple-channel RAM, but 6GB is more than enough. i7s tend to have this sweet spot at 3x2GB, so, save yourself the money and go with 6GB at 1333Mhz, or don't save yourself the money and upgrade to 6GB at 1600Mhz or something like that.
But those are extremely minor quibbles. Great computer, you'll really be happy with it.