Budget Build $600-650

Solution
PCPartPicker part list: http://pcpartpicker.com/p/3imNY
Price breakdown by merchant: http://pcpartpicker.com/p/3imNY/by_merchant/
Benchmarks: http://pcpartpicker.com/p/3imNY/benchmarks/

CPU: AMD FX-6300 3.5GHz 6-Core Processor ($107.99 @ NCIX US)
CPU Cooler: Cooler Master Hyper 212 Plus 76.8 CFM Sleeve Bearing CPU Cooler ($29.98 @ SuperBiiz)
Motherboard: Asus M5A97 R2.0 ATX AM3+ Motherboard ($89.99 @ Micro Center)
Memory: A-Data XPG V1.0 8GB (2 x 4GB) DDR3-1600 Memory ($72.99 @ Amazon)
Storage: Seagate Barracuda 1TB 3.5" 7200RPM Internal Hard Drive ($54.99 @ NCIX US)
Video Card: Asus GeForce GTX 750 Ti 2GB Video Card ($168.66 @ Amazon)
Case: Zalman Z9 Plus ATX Mid Tower Case ($44.99 @ Newegg)
Power Supply: XFX 550W 80+...
PCPartPicker part list: http://pcpartpicker.com/p/3imNY
Price breakdown by merchant: http://pcpartpicker.com/p/3imNY/by_merchant/
Benchmarks: http://pcpartpicker.com/p/3imNY/benchmarks/

CPU: AMD FX-6300 3.5GHz 6-Core Processor ($107.99 @ NCIX US)
CPU Cooler: Cooler Master Hyper 212 Plus 76.8 CFM Sleeve Bearing CPU Cooler ($29.98 @ SuperBiiz)
Motherboard: Asus M5A97 R2.0 ATX AM3+ Motherboard ($89.99 @ Micro Center)
Memory: A-Data XPG V1.0 8GB (2 x 4GB) DDR3-1600 Memory ($72.99 @ Amazon)
Storage: Seagate Barracuda 1TB 3.5" 7200RPM Internal Hard Drive ($54.99 @ NCIX US)
Video Card: Asus GeForce GTX 750 Ti 2GB Video Card ($168.66 @ Amazon)
Case: Zalman Z9 Plus ATX Mid Tower Case ($44.99 @ Newegg)
Power Supply: XFX 550W 80+ Bronze Certified ATX Power Supply ($50.99 @ TigerDirect)
Total: $620.58
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2014-03-29 03:13 EDT-0400)
 
Solution
PCPartPicker part list / Price breakdown by merchant / Benchmarks

CPU: AMD FX-6300 3.5GHz 6-Core Processor ($107.99 @ NCIX US)
CPU Cooler: Cooler Master Hyper 212 EVO 82.9 CFM Sleeve Bearing CPU Cooler ($30.98 @ OutletPC)
Motherboard: Asus M5A97 LE R2.0 ATX AM3+ Motherboard ($72.98 @ OutletPC)
Memory: GeIL EVO Veloce Series 8GB (2 x 4GB) DDR3-1600 Memory ($62.99 @ Newegg)
Storage: Hitachi Ultrastar 1TB 3.5" 7200RPM Internal Hard Drive ($52.00 @ Amazon)
Video Card: Sapphire Radeon R9 270 2GB Video Card ($179.99 @ Newegg)
Case: Corsair 200R ATX Mid Tower Case ($44.99 @ NCIX US)
Power Supply: Antec High Current Gamer 620W 80+ Bronze Certified Semi-Modular ATX Power Supply ($59.99 @ NCIX US)
Total: $611.91
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2014-03-29 03:30 EDT-0400)

This should do better at dayz for the same price.
 
You can build something much faster for that price.

PCPartPicker part list / Price breakdown by merchant / Benchmarks

CPU: Intel Core i5-4440 3.1GHz Quad-Core Processor ($179.99 @ Amazon)
Motherboard: MSI H81M-P33 V2 Micro ATX LGA1150 Motherboard ($54.99 @ Amazon)
Memory: A-Data XPG V1.0 8GB (2 x 4GB) DDR3-1600 Memory ($63.99 @ Newegg)
Storage: Toshiba 2TB 3.5" 7200RPM Internal Hard Drive ($74.99 @ Newegg)
Video Card: Sapphire Radeon R9 270 2GB Video Card ($179.99 @ Newegg)
Case: Antec GX500 ATX Mid Tower Case ($44.99 @ Newegg)
Power Supply: XFX 550W 80+ Bronze Certified ATX Power Supply ($50.99 @ TigerDirect)
Total: $649.93
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2014-03-29 03:35 EDT-0400)