New computer

For WoW, you wouldn't need anything more than this.

PCPartPicker part list / Price breakdown by merchant / Benchmarks

CPU: Intel Core i5-3450 3.1GHz Quad-Core Processor ($179.99 @ Amazon)
Motherboard: ASRock H77M Micro ATX LGA1155 Motherboard ($69.99 @ Newegg)
Memory: Corsair Vengeance 8GB (2 x 4GB) DDR3-1600 Memory ($44.99 @ Newegg)
Storage: Western Digital Caviar Blue 1TB 3.5" 7200RPM Internal Hard Drive ($77.99 @ SuperBiiz)
Storage: OCZ Vertex 4 128GB 2.5" Solid State Disk ($89.99 @ Microcenter)
Video Card: HIS Radeon HD 7870 2GB Video Card ($199.99 @ Newegg)
Case: Antec Three Hundred Two ATX Mid Tower Case ($49.99 @ NCIX US)
Power Supply: Corsair Builder 500W 80 PLUS Certified ATX12V Power Supply ($39.99 @ Newegg)
Optical Drive: Lite-On iHAS124-04 DVD/CD Writer ($15.99 @ SuperBiiz)
Monitor: Asus VH236H 23.0" Monitor ($139.99 @ NCIX US)
Operating System: Microsoft Windows 7 Home Premium SP1 (64-bit) ($90.36 @ Amazon)
Total: $999.26
(Prices include shipping, taxes, and discounts when available.)

If you would like to overclock, please let me know and I'll gladly swap out some components for you  

Also, next time, please fill out the template on this thread - http://www.tomshardware.com/forum/353572-31-build-upgra...

it will last for 5 years but you will have to get another of the same video card 3 years later. no guarantees

if its wow, you can play the game at max for 1000 dollars with plenty of power to spare but this has the horsepower to get max settings in BF3

used a very cheap motherboard but has everything you need. i have it and its great
http://pcpartpicker.com/p/iJ4v

Very nice rig, Troll. I love the monitor you used in it   one sexy thing... I'm big on the height adjust-ready monitors.

i have a washed down version. no quick fit and doesnt come with calibration or a displayport cable  

Awww  

I'm just making sure that the computer u made up can play all cod games and borderlands. Also i need a sound card and i dont know what makes a good mouse.

nevermind about the mouse

COD=i can run it with intergrated graphics at default settings

^ This

I downloaded steam's 3 day MW3 trial the other day..my goodness I'm surprised people used to purchase a 580 to run Black Ops lol.

i have someone that plays MW3 with trifire 7970s on a 1440x900 screen.

Oh my goodness..... LOL... Why must they put good hardware to waste...