This is a full list of everything you would need including headset with mic. You could wait till I think before mid-Oct. for the new AMD cards to be in stores. R9-290x or lower R9-280x, or R9-270X based on budget; there is also a Battlefield 4 edition coming. If you don't wait get the 7950 or higher I believe have the GCN and new Mantel API. I would think an FX-8350 if you do video recording of your games on your PC while playing or lower FX-6300 if not. Also Kaveri is coming out soon we hope, and that might play COD and BF3 like you want. Get a SSD if possible, add old HDDs for extra storage. This Asus motherboard has Remote GO! where you can use tablets and smartphones with your computer, don't see this on other boards yet, check out the videos of it. SeaSonics PwrSplys have a good reputation. I've been looking for myself, and this is about what I want to get, I have the pwrsply, and accessories, and an old case. I'm sure you will enjoy what ever you decide, and still want an upgrade later, so think I'm thinking like get something affordable now, and upgrade in 2-5 years, or when you see a new game in the future come out you need to play on Ultra. Fast RAM with low profile heat-spreaders. Everything on here is fully compatible, and able to be overclocked. Good luck. Happy to help. Any questions just ask.
PCPartPicker part list:
http://pcpartpicker.com/p/1IKBS
Price breakdown by merchant: http://pcpartpicker.com/p/1IKBS/by_merchant/
Benchmarks: http://pcpartpicker.com/p/1IKBS/benchmarks/
CPU: AMD FX-6300 3.5GHz 6-Core Processor ($99.99 @ Newegg)
CPU Cooler: Cooler Master Hyper 212 EVO 82.9 CFM Sleeve Bearing CPU Cooler ($29.98 @ Outlet PC)
Motherboard: Asus M5A99X EVO R2.0 ATX AM3+ Motherboard ($109.99 @ Newegg)
Memory: G.Skill Ares Series 8GB (2 x 4GB) DDR3-2133 Memory ($76.99 @ Newegg)
Storage: Kingston HyperX 3K 120GB 2.5" Solid State Disk ($89.99 @ Amazon)
Video Card: Sapphire Radeon HD 7950 3GB Video Card ($199.99 @ Newegg)
Case: Thermaltake VL80001W2Z ATX Mid Tower Case ($21.99 @ Microcenter)
Power Supply: SeaSonic 620W 80 PLUS Bronze Certified ATX12V / EPS12V Power Supply ($79.99 @ Amazon)
Optical Drive: LG GH24NS95 DVD/CD Writer ($14.98 @ Outlet PC)
Keyboard: V7 Standard PS/2 Keyboard Wired Standard Keyboard ($6.36 @ Amazon)
Mouse: Gear Head OM3400U Wired Optical Mouse ($2.99 @ Mac Mall)
Headphones: Logitech H110 Headset ($6.33 @ Amazon)
Total: $739.57
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2013-09-28 23:34 EDT-0400)
PS. I'm trying to wait it out till the new AMD GPUs come out on the market early Oct. really want to just buy this config and be done with waiting for the next new thing.