Total: £710 approx.
Plus around £25 for dvd drive and wiress card.
I butchered this list but it gives you a rough idea. This build is the exact same as yours except a better power supply and a gtx 570.
This does not include taxes or shipping.
754.00 GBP = 1,165.61 USD So i would say it's a pretty good deal as long as you don't save more than $50 in your country, it's not worth the time w8ing for the components to arrive and the assembley . +you get WARRANTY SERVICE: STANDARD WARRANTY: 3 Year Labour
Cons: the rig looks pretty shaggy, you can probably build a more efficient pc for that amount.