|You can transfer your files, you emails and some of your settings, but not your programs. The ones that are not Microsoft, may be transferable to another system if you have the install disks (by reinstalling only), but not all of them will run under Windows 7.|
If you are interested in a new system, decide if you want to build or purchase complete, then look around and see what appears to have what you need. Zero in on a price range you are looking at and pick out 2 or 3 top contenders. Post links to the ad/web page for opinions and include a list of games you plan to play. We can give you a better opinion then. Look at Tigerdirect and Newegg as well as a local store's website or two. Look for what processor as well as the speed, how much memory, and what graphics are included (and what graphics upgrade is supported (PCIe-16-2x, etc)).
You have to be a little bit crazy to keep you from going insane.