Diablo 3 PSU and graphic card question <3

http://www.google.com/products/catalog?hl=en&q=s5212y+p...

This is my computer model's best upgrade (that I found) and am wondering if this would be a proper psu to be able to run a high-demand card life a GeForceGTx 260 from Nvidia? I know size of the tower is an issue, but it is probably the smallest size issued, it is capable of fitting in a 2'(l) x 1'(h) x 6''(w) space. Also, if I were to need a new case, where would anyone be able to point me in the right direction? Thank you, and love you all. <3