Lenovo Thinkserver... Not Kidding. Best pc I'v ever owned. fast as Sh#t I kid you not.... renders videos before you can name the file Amazon.com: Lenovo ThinkServer TS140 70A4001MUX Intel Quad Core Xeon E3-1225v3 4GB RAM 500GB HDD Desktop Server PC: Computers & Accessories
I like your style

Fastest rig I've ever owned: Amazon.com: Dell PowerEdge T20 tower Server System /Intel Xeon E3-1225 v3 3.2GHz Quad Core CPU / 4GB Memory / 1TB Hard Drive / DVDRW Drive / No Operating System: Computers & Accessories
Throw in another 16GB ram for $90: Crucial 16GB Kit (8GBx2) DDR3/DDR3L-1600MT/s (PC3-12800) DR x8 ECC UDIMM Server Memory CT2KIT102472BD160B/CT2CP102472BD160B at Amazon.com
PC + RAM = $500 (assuming you have an existing Windows license).