Gaming build for specific game only.

Hello,
just had an idea gaming build, was curious if a more experienced builder would briefly look and maybe say if there is a flaw in build. Game is Diablo III, and since its not going to be used for much else, trying to keep low priced

http://secure.newegg.com/WishList/PublicWishDetail.aspx...

I need a heatsink, and other than that i have case, powersupply(which need to check to make sure its large enough) and don't know if i really need anything else.

Edited for link to hopefully work also my power supply is LC-A420ATX. Not sure if compatible for motherboard or graphics card.