Anolaran,
My system is as follows:
Dell Deminsion 9150
Pentium D cpu
3GB RAM
160GB SATA HD
Nvidia 8800 video card
WindowsXP
I can run two instances of WoW at the same time without any problem. I use this computer strictly for running WoW, so I don't have any extra "junk" installed on it (antivirus/antispyware, office apps, etc.) My experience has been WoW isn't as resource intensive compared to other modern computer games, so you shouldn't need too beefy of a system to play. You can put together a good WoW gaming system for $600 - $800.
Wilferil
Ok so i have had some trouble with my computer lately with playing WoW. It has been INCREDIBELY laggy. Even in inn's i can barely move. Anyway, i wanted to know what you guys play on and what you would recommend me. Please tell me what specs you are using as well. Every lil detail helps! Thanks guys. email me back or hit me up on myspace. www.myspace.com/obeastt. You can find me on the aliance guild as Anolaran or Borean Tundra's serever Recneps.