RE: Upgrading Dell XPS 8300 - Need Case Change?
Based on what you've said. You have already invested money into new components abou 200-300$ you are better off building your own computer, and to cut costs, use a linux operating system(Free). Until you can afford Windows OS. I know that a whole lot of steam games work with Linux. So I know that, you will have no problems playing games on linux. (But you need to research the version of linux you want to use).