Looks like a good selection to me. The only thing I would look into is maybe reviewing the video card. You say it is for CAD drafting, and I know some design software have built-in enhancements for using nVidia CUDA. Just make sure that the software that you use on a regular basis does not benefit greatly from using an nVidia card.
I'm not a fanboy or anything, just want to make sure you're happy with your final build. Of course, many times the production series video cards for either AMD or nVidia cost much more than $159, so maybe that's out the window.
CPU: Intel Core i5-2500K 3.3GHz Quad-Core Processor ($199.99 @ NCIX US)
CPU Cooler: Cooler Master Hyper 212 EVO 82.9 CFM Sleeve Bearing CPU Cooler ($29.33 @ NCIX US)
Motherboard: Asus P8Z68-V LE ATX LGA1155 Motherboard ($135.99 @ NCIX US)
Memory: G.Skill Ripjaws X Series 16GB (4 x 4GB) DDR3-1333 Memory ($99.99 @ Newegg)
Hard Drive: Crucial M4 64GB 2.5" Solid State Disk ($83.99 @ Adorama)
Video Card: Sapphire Radeon HD 6870 1GB Video Card ($159.99 @ Newegg)
Case: Antec Nine Hundred Two V3 ATX Mid Tower Case ($112.99 @ SuperBiiz)
Power Supply: SeaSonic 650W ATX12V / EPS12V Power Supply ($139.99 @ Newegg)
Optical Drive: Lite-On iHAS124-04 DVD/CD Writer ($17.99 @ Newegg)
(Prices include shipping and discounts when available.)
Any thoughts on this? Thank you.
If you're using Autodesk you can get by with way less of a CPU unless you're doing some intense editing - then I'd be more inclined to suggest a Xeon E3 / ATI Fire Pro combination. I'd say go for a Fire Pro V5800 and an i3-2120.
I'd get a 500GB HD instead of the SSD as well - I have the Crucial M4 and you will run out of space if you don't store everything on a secondary HD or a central server.