It seems that most people who visit the computer forum wants the best system for the lowest price.
So I'm going to post what I think is the cheapest system that will:
(a) run WoW+Cata on ultra and manage ~40 fps at 1080p during 25man raids
(b) have the lowest possible price tag.
Advice, and suggestions are welcome as I am sure many people browse this forum looking for this exact information.
Also feel free to come up with your own ultimate value configuration
Here's what I had in mind:
Intel Core i3-550 Clarkdale 3.2GHz - $114.99 - http://www.newegg.com/Product/Produc...82E16819115065
ASRock H55M-LE LGA 1156 Motherboard - $64.99 - http://www.newegg.com/Product/Produc...82E16813157190
GeIL Value PLUS (2 x 2GB) DDR3 1600 RAM - $45.99 - http://www.newegg.com/Product/Produc...82E16820144461
MSI N460GTX Cyclone 768D5/OC GeForce GTX 460 - $149.99 - http://www.newegg.com/Product/Produc...82E16814129163
XIGMATEK ACXTNRP-PC502 500W 80+ Bronze- $44.95 - http://www.newegg.com/Product/Produc...82E16817815008
Linkworld 313-06-C2228 Blue/ Silver Steel Case - $19.99 - http://www.newegg.com/Product/Produc...82E16811164093
SAMSUNG Spinpoint F4 HD322GJ/U 320GB - $42.99 - http://www.newegg.com/Product/Produc...82E16822136075
ASUS Black 24X DVD+R 8X DVD+RW - $16.99 - http://www.newegg.com/Product/Produc...82E16827135204
Total price tag = $520.87
You should be able to overclock the CPU to at least 4 GHz