I'm helping a friend put together a brand new system, and he needs everything included. He isn't very tech savvy, but has the confidence to assemble the system himself. I think that the 955 is a more sound choice than the 940, because he most likely won't be overclocking the system. I don't want to go on and on with a justification of every part, but I did a fair amount of research for each selection. Feel free to share your comments.
http://secure.newegg.com/WishList/PublicWishDetail.aspx?WishListNumber=8565294
http://secure.newegg.com/WishList/PublicWishDetail.aspx?WishListNumber=8565294