For the database server, it's a dual processor/dual core Opteron 270 with 8Mb RAM, 8 x 15k SCSI PCI-X Raid 10 array, FreeBSD 6, MySQL 5 - runs like the wind. Loads never hit 0.5.

The main webserver is the Quad Opteron with similar specs. We also have image server, irc, attachment, dns, and a slave search server.
We went with webnx in the end - best prices in town - look for Dan Paultz and tell him Erwin sent you - he'll look after you well.