I just priced out a Dell T7500 with dual Xeon 5680's (3.33GHz) and minimal graphics, memory, HD. It comes out at $3646 which is very cheap considering that the CPUs alone are each $1700 at provantage and $1750 at newegg. Add the 1100 Watt 85% efficient power supply and you end up at $3600 just for CPUs and PS.
That means that you get the motherboard (with SAS controller-LSI 1068e), case, cheap graphics adapter, little memory, HD, DVD-Rom, mouse, keyboard for free.
You can get 24GB of DDR3-1333 ECC registered memory for $900 at newegg.
All you need is a couple of Intel SSDs and a graphics card of your choice and you have a kick-ass system for a very fair price.
Your
geekbench score would be around 22000 (see Supermicro X8DA3 score with same CPUs).