Figure I'll throw my hat into the ring
On a 600Gbps (actual utilization to the Internet) network:
500Mbit commit @ $4/Mbit - $2,000/mo
Dell SC1425 Dual 2.8Ghz Xeon / 8GB RAM / 2x250GB SATA - $99.95/mo
Supermicro Quad Core L5410 / 8GB RAM / 2x250GB SATA - $149.95/mo
Pick and choose the servers, of course. Each server is on remote reboot, and 1000Mbps ports.
So, $2500/mo roughly.
phil at reflected dot net if interested.
Good luck on your search!
-Phil