Wow, looks like I'm right in with the 100 percentile crowd right now, bought mine a while back and had some preconfigured extras.
Worth every penny,

.
It has so far run everything I have installed on it flawlessly (well, relatively speaking of course, somtimes setup issues popped up but, through the experts here and some deep research every issue worked out) :
XP Pro
OSX 10.4.3
Server 2003 Enterprize Edition
Vista Business
My machine is a 2623D7U, upped the ram to 1.5, HD's (i have three)
100g 7200 rpm, atheros wireless (vast improvement over the intel POS). WAN.