Seems a bit pricey on some things...

Not sure where you are located but check for deals, if there's a Fry's nearby they often have some really good prices, pretty good deal on a core 2 duo + mainboard right now for example (although I dislike ECS boards).
http://www.frys-electronics-ads.com/

Also do you really need 320gb HDD for these boxes? seems excessive if all you're using them for is WoW.