Dell Business has the Dell PowerEdge T420 Xeon E5 Server for $1039 - $100 off with coupon code G496TKS8?6592? [Exp 7/31] = $939 with free shipping. Dual-socket, so you can install a second CPU if it suits your fancy. Received a very good review from ITPro.
Intel Xeon E5-2403 1.80GHz CPU, 2GB RAM, 500GB HDD No Operating System, On-Board Dual Gigabit Network Adapter
Deal has expired