You're spending a lot of unnecessary cash on the parts.
Oh, and make sure you're buying from a .uk site if your english or a .ie if your irish. Because if you try get something from america in england, you're going to be spending around $500 on shipping.. which isn't worth it.
Get a computer magazine and search up the parts you really want; then with the extra money you saved, get either a gtx 470, or if you can strectch it again, get 2 gtx 460's and use SLI.