Nice. I just fired up my new workstation, and am installing Inventor/AutoCad as I type.
Fairly similar build... 4-core 3ghz 64bit Xeon, 12gb ram, dual ati firepro v5700 video cards. I'm looking forward to running Inventor without crashing for the first time in a long while. It's amazing how much faster it is than the 5+year old machine I was working on before.