I'm doing a build with the above components, and I would like to know of a well priced yet great performing PSU. Is it possible to run this set up with 750 or 700? The exact cards are the ASUS GTX 560 DCUII OC. I am already spending $855 on the build, not including taxes, and all that is left is the PSU. I can only spend up to $1000 in total.