Yes, a 1000W will be great. A major problem with people building computers and I’ve seen it time and again over the years is underpowering their components which leads to very strange almost untraceable behavior. This will be great. As for video cards, my dream would be 3x GTX 580s, but that would run quite a bit of money, but it’s what I want for sure :). They’re $519/ea (newegg) and only 1.5gb cards, so it’s definitely not the best deal and I haven’t done my video card homework, just wanted to let you know I have 2x460’s and they run very hot…
Also, the i7 2600 is best in class and you’ll be very happy with the performance 