ANTOnline offers the Lenovo ThinkServer Intel Haswell Xeon v3 3.2GHz 5U Tower Server, model no. 70AQ000PUX, for $589.99 with free shipping. That's $20 under last month's mention and the lowest total price we've seen for this server. (It's also a current low by $185.) It features an Intel Xeon E3-1225 v3 3.2GHz Haswell quad-core processor, 4GB RAM, DVD ROM, two 5.25" drive bays, four 3.5" drive bays, and Gigabit Ethernet.
Update: Specs corrected