Best PC build for low-end gaming?

Solution
If there's no budget, then why go for low end? lol Performance could change drastically between $400 and $600.

Here is a good $400 build:

PCPartPicker part list / Price breakdown by merchant / Benchmarks

CPU: AMD Athlon II X4 750K 3.4GHz Quad-Core Processor ($79.99 @ Amazon)
Motherboard: Gigabyte GA-F2A55M-HD2 Micro ATX FM2 Motherboard ($44.99 @ Newegg)
Memory: A-Data XPG V1.0 4GB (1 x 4GB) DDR3-1600 Memory ($27.99 @ Newegg)
Storage: Western Digital Caviar Blue 320GB 3.5" 7200RPM Internal Hard Drive ($37.45 @ Amazon)
Video Card: Sapphire Radeon HD 7770 GHz Edition 1GB Video Card ($105.98 @ SuperBiiz)
Case: Xion...
If there's no budget, then why go for low end? lol Performance could change drastically between $400 and $600.

Here is a good $400 build:

PCPartPicker part list / Price breakdown by merchant / Benchmarks

CPU: AMD Athlon II X4 750K 3.4GHz Quad-Core Processor ($79.99 @ Amazon)
Motherboard: Gigabyte GA-F2A55M-HD2 Micro ATX FM2 Motherboard ($44.99 @ Newegg)
Memory: A-Data XPG V1.0 4GB (1 x 4GB) DDR3-1600 Memory ($27.99 @ Newegg)
Storage: Western Digital Caviar Blue 320GB 3.5" 7200RPM Internal Hard Drive ($37.45 @ Amazon)
Video Card: Sapphire Radeon HD 7770 GHz Edition 1GB Video Card ($105.98 @ SuperBiiz)
Case: Xion XON-560 MicroATX Mini Tower Case ($29.99 @ Newegg)
Power Supply: XFX 550W 80+ Bronze Certified ATX Power Supply ($49.99 @ NCIX US)
Optical Drive: LG GH24NSB0 DVD/CD Writer ($15.99 @ Microcenter)
Total: $392.37
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2014-02-06 15:51 EST-0500)


And a good $600 build:

PCPartPicker part list / Price breakdown by merchant / Benchmarks

CPU: AMD FX-6300 3.5GHz 6-Core Processor ($119.99 @ Newegg)
Motherboard: ASRock 970 PRO3 R2.0 ATX AM3+ Motherboard ($64.99 @ Newegg)
Memory: A-Data XPG V1.0 8GB (2 x 4GB) DDR3-1600 Memory ($69.99 @ Newegg)
Storage: Hitachi Ultrastar 1TB 3.5" 7200RPM Internal Hard Drive ($47.92 @ Amazon)
Video Card: XFX Radeon HD 7870 2GB Video Card ($179.99 @ Newegg)
Case: BitFenix Shinobi Window ATX Mid Tower Case ($49.99 @ Newegg)
Power Supply: XFX 550W 80+ Bronze Certified ATX Power Supply ($49.99 @ NCIX US)
Optical Drive: LG GH24NSB0 DVD/CD Writer ($15.99 @ Microcenter)
Total: $588.85
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2014-02-06 15:54 EST-0500)
 
Solution