I have built this computer for mostly gaming in mind. I would like to play most games on at least medium, and my budget is around $900-$1000. I also have no plan on overclocking.
PCPartPicker part list: http://pcpartpicker.com/p/1ip5Q
Price breakdown by merchant: http://pcpartpicker.com/p/1ip5Q/by_merchant/
Benchmarks: http://pcpartpicker.com/p/1ip5Q/benchmarks/
CPU: Intel Core i5-3450 3.1GHz Quad-Core Processor ($194.97 @ Amazon)
Motherboard: ASRock Z75 Pro3 ATX LGA1155 Motherboard ($74.99 @ Newegg)
Memory: Corsair Vengeance Pro 8GB (2 x 4GB) DDR3-1600 Memory ($75.99 @ NCIX US)
Storage: Samsung 840 Series 120GB 2.5" Solid State Disk ($93.99 @ Adorama)
Storage: Western Digital Caviar Blue 1TB 3.5" 7200RPM Internal Hard Drive ($59.99 @ NCIX US)
Video Card: Asus GeForce GTX 660 2GB Video Card ($192.98 @ SuperBiiz)
Case: Corsair 200R ATX Mid Tower Case ($49.99 @ Microcenter)
Power Supply: Corsair CX 500W 80 PLUS Bronze Certified ATX12V Power Supply ($49.99 @ Microcenter)
Operating System: Microsoft Windows 8 (OEM) (64-bit) ($89.73 @ Outlet PC)
Monitor: AOC e2051Sn 60Hz 20.0" Monitor ($99.99 @ Best Buy)
Keyboard: Logitech K100 Wired Slim Keyboard ($10.14 @ Amazon)
Mouse: Logitech M100 Wired Optical Mouse ($9.89 @ Outlet PC)
Other: Audio Technica ATR4750 Desktop Condenser Microphone ($11.95)
Other: USB 2.0 Wireless Gaming Controller Receiver Adapter For Xbox 360 Xbox360 ($11.19)
Total: $1025.78
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2013-07-19 22:25 EDT-0400)