So you need the works, have it all under $1000, and learn a thing or two. Let's get started!
You need 9 things to build a computer, especially if you're a gamer.
Here is what I picked from NewEgg (Newegg is a bit better than TigerDirect in terms of prices. If you want to buy INSURANCE (+2 year warranties), TigerDirect is a little better. It's all personal taste <3)
CPU = Quad Core @ 3.2 GHz! This will be fine for you. Unless you do 3D Rendering and crazy stuff, AMD is the best price-performance you'll get; period.
Hard Drive = Great. Remember to use PROMO CODE: SEAGATE6!!!
RAM Memory = 4GB of DDR3 is amazing. CAS Latency and timings are fine.
Motherboard = Future proof! USB 3.0 and SATA 3 to support all future devices.
Power Supply = Amazing. Corsair makes the best; period. Don't ever go cheap on your future PSUs. It's 80+ CERTIFIED meaning it's efficient, it's quiet, and will last for a very long time. Remember to use PROMO CODE: psusave10!!!
Video Card = Great. Unless you've got like a 30" monitor, the 5770 is flawless. It also has Direct X 11 for future games and runs silent and very efficient. Not much better than this.
Operating System = Great. It's Windows 7 What can you hate?