650w would be enough for two of those cards. But for $10.00 more you can get the GTX 560 Tis which are a better card then the just the 560. Now if you are going to run resolution higher than 1920x1200 or more than one monitor then the 2GB of Vram you will need.
If not then just go with the 1GB of Vram. But yes eveything that you linked us to will work as long as your MOBO will support SLI. I do wish you good luck on this.
Thx guys and gals thx to the comments im going to get the 1gb to save money since im on a single screen, and get a 650 psu to save aswell, as far as the TI suggestions and my mobo being able to sli currently it cant its a crappy stock mobo with 1 16 pci-e and a length limit on the gpus of 8.25", but in the future i plan to buy a new mobo that has 4 pci-e slots and plenty of room for long graphics not to inter fear with the plugs.