I have a Slimline s3120n PC. I am planning on building a decent gaming pc, but I have a tight budget. Here is all the info for my PC (http://www.newegg.com/Product/Product.aspx?Item=N82E16883107396). Here is my question. Could I disassemble my PC, take the MoBo, Optical Drive, and Hard- Drive, put it inside a micro ATX case, install a decent graphics card, change the PSU, replace and upgrade the ram, and make it my budget rig? If I can do that, can I install any graphics card that will work with the PSU? Thanks guys.