For a start there the minimum systme requirements for world of warcrfat double all of that if you want it to run smoothly.
So your gona need atleast 64mb card. and a 1.4ghz CPU, and 512mb ram.
If its just a pc you want without a monitor ill do some reaserch and find all the parts you need aswell as a new pc case if you want. I'll do it fro as cheep as possible but ill make sure you can play WoW ok. Email me at mightY_max.firstname.lastname@example.org
if you want me to sort out all the parts you need and were to get them from.
Many Thanks. Im off to bed in 20 mins so i'll start lookin tommorow in the morning (i live in uk)