I own the computer featured from this website https://www.woot.com/blog/post/hp-pavilion-desktop-with-dual-core-processor-and-6gb-ram-1 I want to make it a gaming pc it looks like it supports another gpu but not sure, I want to know a good gpu to buy and or a better CPU to buy to make it better, I don't need a top of the line gaming pc but I want a decent one. Remember the gpu and CPU need to be supported and workable for my computer