You should play Warhammer Age of Reckoning instead of WoW. Thousand times better, doesn't take to much more than WoW to run. WaR is really the game that WoW wanted to be
Eh, that game is OK. I still got bored with it. Play Age of Conan, now that is a real game. Very immersive world with realistic looks instead of a bunch of cartoons running around. Age of Conan has a soundtrack and certain areas of the world are actually voice acted so you don't have to read stories every time you get a quest. If a person isn't voice acted, you read a conversation and get different responses to give. The stories of the game actually feel real and you can get into them. Combat is actually somewhat interactive instead of just mashing your combos. True, the game still has alot to work on but it is a far better game than WoW and War combined. There also aren't millions of quests where you have to go gather 15 boar feet and 10 rabbit ears.... LAME. Get some real quests that actually make sense and progress a story.
Edit: PC_Caveman, don't build a rig around WoW because it is years old and as you said, its not going to get more demanding for PCs but EVERYTHING else is. Why would you build a rig thats based around something thats years behind in quality. Thats just a waste of money