Here is a selection of components I have in mind for a CAD workstation based on the E8600. I work in 3D (Rhino 3D) and I need more speed and memory. This would be my first attempt to build a computer, so if there is a wrong step here, please let me know. Thank you for your insights.
That is a very expensive motherboard for your use. I would pick up a quality P45 chipset board and 4GB of DDR2 RAM. The speed difference between DDR2 and DDR3 is almost non-existent. You might as well get 4GB since you have a 64-bit OS. Here are a few parts to consider: