Upgraded my home PC and used the existing equipment to upgrade my home server as well. All told, I only came out of pocket about $270 since I recycled as much as possible (denoted by *) and used a $400 Amazon gift card to buy the new components (CPU, RAM, Mobo, GFX Card) for the desktop. Here are the build outs.
Desktop
Intel Sandy Bridge Core i5 2500k 3.3Ghz
Kingston 8GB of DDR3 RAM (Still have room for another 8GBs)
ASRock P67 Pro3 Motherboard
EVGA Nvidia GeForce GTX GTX 660
*750GB Western Digital HD
*500GB Hitachi HD
*Antec 500w PSU
*Coolermaster CM Stacker Case
Server
*Intel Core2Quad Q6600 @ 2.4 Ghz
*ASUS P5Q Pro Motherboard
*8GB DDR2 RAM
*Nvidia Geforce 6800 GS
*1x 150GB Velociraptor 15k RPM HD
*5x 1TB Western Digital Green HD in RAID 5
1x 2TB Western Digital Green HD
*Corsair TX850w PSU
Diablotek EVO Mid Tower ATX case
I've included the link to the Diablotek computer case because I was blown away by the build quality, versatility, and feature set. At the time, I was searching for a mid tower case that could accommodate plenty of hard drives while providing proper cooling in an enclosure that did not weight a ton completely empty. This case is not only light but it has a total of 7 dedicated 3.5 inch drive bays (five include drive rails) and also includes four 120mm case fans. For $42 US, this is by far the best case I've used in this price point. My only complaint is that I have nowhere to hide all of the excess PSU cables due to the case's form factor. However, that is mostly my fault since I re-used a PSU with excessive power options instead of a modular PSU.