I got a deal from a friend. He said he would sell me his HP Compaq 8200 Elite Mini Tower for $130. So what I was going to do is upgrade it. I want to put a GPU in there so I can have a second backup rig just in case. What else do I need to upgrade the computer successfully and get the results I want? (My friend is selling me the computer with all the components but the power cable. The PSU has a 320 watt capacity) S0, the main question is, what do I need to buy/do to maximize my PC experience and successfully install the GPU and get results?