All you need is a gaming card. And the machine comes with Windows 7 Ultimate (somehow I doubt any of your rigs have legal compliant s/w) and 1 year warranty. Add another $100 and you get an additional 2 year warranty. Theres a reason I got out of building PCs for my clients and utilizing systems from manufacturers like HP or Dell. Warranty coverage, superior QA/QC on component compatibility, pricing, and overall convenience. Don't get me wrong, I enjoy building systems, but homebrew is rarely the answer for most gamers, especially nowadays. You would upgrade your hardware to try and push 30-40 fps, so you wouldnt get fragged all the time. Now who really cares if I get 150 or 180 fps, its not like im gonna notice a difference.