This is the baseline or yardstick spec that I recommend running comparison against for under $1,000 builds.
You can get the following components, which may be a better deal if you already have a Case and Power Supply Unit lying around, or have a greater than $1,000 budget.
GPU: GeForce GTX760 with at least 2GB --- $320
CPU: Intel Core i5 4670K (3.4GHz), --- $250
MOBO: Gigabyte GA-Z87X-UD3H (Z87 Chipset), --- $227
RAM: Kingston HyperX 8GB Kit (2x4GB) 1333MHz/1600MHz DDR3, --- $70
SSD: Samsung 830 or 840 Series 120GB SSD, --- $128
If you have a better budget (including the case and PSU) then get a better GPU than the GTX760, never get anything less than the GTX760 if you plan to play modern 3D Games beyond 2H 2013!
Some vendors may charge up to +$25 for one part and charge $25 less for another part (usually the CPU and Graphics Card).