The Antec Earthwatts 650W is more than sufficient for your planned build. A system with a single GTX560 requires a 450W PSU with two 75W 6-pin PCIe power connectors and 30A on the 12V rails.
Most 450W PSUs only have one 6-pin PCIe power connector so it would be asier to start looking at 500W PSUs. My signature has a recommended PSUs thread that is good as well as a PSU guide. The Antec Earthwatts 500W is sufficient for your build. If you have a website that we can take a look at and tell us your budget then we can make some recommendations.
Don't use a green drive as your primary storage. Greens drives are slow, and are constantly spinning down to conserve energy. You'll be highly dissatisfied with the performance of the green drive. Buy a WD blue or black drive with at least a 32 MB cache.
Thanks for the quick replies guys! Um should I consider an SDD for my boot drive then? And get a WD blue/black drive as my secondary storage drive? Also Rugger you mentioned 500W is sufficient for my build but if I add a SDD to this build will it alter the needed PSU by much?
A SSD is always nice to have, but not manditory.
A green drive should only be used for a storage drive you don't access often. Something to store pictures, movies, etc on.
If you decide on a SSD, use this tutorial to avoid pitfalls and mistakes when installing the O/S: http://www.overclock.net/t/1156654/seans-windows-7-inst...
A couple minor points; From my experience with WD Black drives, I find them much noisier than the Blue. Apparently others do as well from the posts I've read. Another thing is an idea you may want to consider using your SSD. I filled up my small 64GB SSD quickly and was considering a new larger one. But I decided to try Intel® Smart Response Technology, whereby the SSD is used a a huge cache for the HDD (boot drive). http://www.hardwaresecrets.com/article/Intel-Smart-Resp...
I can vouch for the fact that it works, and it works well. And it is totally invisible to the user. My main drive now seems as fast as my SSD did alone, except its size is huge compared to the SSD. And no juggling files between drives. Just something to consider.