Making a game computer, need suggestions?

Alright guys, i’m making a gaming computer. It is surprisingly channleging to pick out all the parts, so i was going to tell you guys what i have so far and see what suggestions you have! For the ram, http://www.valueram.com/datasheets/KHX8500D2_2G.pdf and i planned on getting 3 of those, so that’s 6gb. For the video card, i planned on gettting a NVIDIA GeForce 9400 GT 1GB DDR2 PCI Express Graphics Card. My budget is aroung 800 dollars, so i can’t getting anything to crazy awesome. I’m having a very hard time on picking the processor, sound card and mother board.