I want to build a computer to do three and four dimensional CAD Modeling for prototypes for scramjets and nuclear powered spacecraft. I prefer to spend $2K (just the box; never mind the monitor, mouse, keyboard, speakers, etc.) but am willing to go as high as $3k if there's something particular that could benefit my purpose. I'll wait until November so I can get the DX11 GTX 300 graphics card. Any suggestions?