Case: It's a great case, but doesn't look very business like. I would downgrade to the Antec 300 or even the 200. You won't need the extra fans anyway.
HDD: The WD is not the best choice right now. I would get a Samsung Spinpoint F3. It comes in 500 GB ($55) or 1 TB ($85). It's faster, quieter, cooler and cheaper/GB.
RAM: You need DDR3 sticks, not DDR2. I recommend these: G.SKILL Ripjaws Series 4GB (2 x 2GB) DDR3 1600 mhz CAS Latency 7
Rest is good.