Serious gaming build for $667

Solution
1 a kaveri built..
http://pcpartpicker.com/p/3thdu
PCPartPicker part list: http://pcpartpicker.com/p/3thdu
Price breakdown by merchant: http://pcpartpicker.com/p/3thdu/by_merchant/
Benchmarks: http://pcpartpicker.com/p/3thdu/benchmarks/

CPU: AMD A10-7850K 3.7GHz Quad-Core Processor ($174.99 @ NCIX US)
CPU Cooler: Cooler Master Hyper 212 EVO 82.9 CFM Sleeve Bearing CPU Cooler ($29.98 @ OutletPC)
Motherboard: MSI A88XM-E45 Micro ATX FM2+ Motherboard ($62.99 @ Amazon)
Memory: G.Skill Ripjaws X Series 8GB (2 x 4GB) DDR3-2133 Memory ($71.10 @ Newegg)
Storage: Seagate Barracuda 1TB 3.5" 7200RPM Internal Hard Drive ($54.98 @ OutletPC)
Video Card: MSI Radeon R7 250 1GB Video Card ($92.98 @ Newegg)
Case: NZXT Tempest 410 Elite...
1 a kaveri built..
http://pcpartpicker.com/p/3thdu
PCPartPicker part list: http://pcpartpicker.com/p/3thdu
Price breakdown by merchant: http://pcpartpicker.com/p/3thdu/by_merchant/
Benchmarks: http://pcpartpicker.com/p/3thdu/benchmarks/

CPU: AMD A10-7850K 3.7GHz Quad-Core Processor ($174.99 @ NCIX US)
CPU Cooler: Cooler Master Hyper 212 EVO 82.9 CFM Sleeve Bearing CPU Cooler ($29.98 @ OutletPC)
Motherboard: MSI A88XM-E45 Micro ATX FM2+ Motherboard ($62.99 @ Amazon)
Memory: G.Skill Ripjaws X Series 8GB (2 x 4GB) DDR3-2133 Memory ($71.10 @ Newegg)
Storage: Seagate Barracuda 1TB 3.5" 7200RPM Internal Hard Drive ($54.98 @ OutletPC)
Video Card: MSI Radeon R7 250 1GB Video Card ($92.98 @ Newegg)
Case: NZXT Tempest 410 Elite (Black) ATX Mid Tower Case ($93.76 @ SuperBiiz)
Power Supply: Corsair CX 600W 80+ Bronze Certified Semi-Modular ATX Power Supply ($64.99 @ Amazon)
Optical Drive: Asus DRW-24B1ST/BLK/B/AS DVD/CD Writer ($19.98 @ OutletPC)
Total: $665.75
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2014-04-17 07:19 EDT-0400)

2 fx rig
http://pcpartpicker.com/p/3thmw
PCPartPicker part list: http://pcpartpicker.com/p/3thmw
Price breakdown by merchant: http://pcpartpicker.com/p/3thmw/by_merchant/
Benchmarks: http://pcpartpicker.com/p/3thmw/benchmarks/

CPU: AMD FX-6300 3.5GHz 6-Core Processor ($109.99 @ Amazon)
CPU Cooler: Cooler Master Hyper 212 EVO 82.9 CFM Sleeve Bearing CPU Cooler ($29.98 @ OutletPC)
Motherboard: Asus M5A99X EVO R2.0 ATX AM3+ Motherboard ($107.99 @ NCIX US)
Memory: G.Skill Sniper 8GB (2 x 4GB) DDR3-1600 Memory ($74.99 @ Newegg)
Storage: Seagate Barracuda 1TB 3.5" 7200RPM Internal Hard Drive ($54.98 @ OutletPC)
Video Card: Asus Radeon R7 260X 2GB Video Card ($139.99 @ Amazon)
Case: Zalman Z9 Plus ATX Mid Tower Case ($67.11 @ NCIX US)
Power Supply: Corsair CX 600W 80+ Bronze Certified Semi-Modular ATX Power Supply ($64.99 @ Amazon)
Optical Drive: Asus DRW-24B1ST/BLK/B/AS DVD/CD Writer ($19.98 @ OutletPC)
Total: $670.00
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2014-04-17 07:28 EDT-0400)
 
Solution

SoumyaHD

Honorable
Mar 19, 2013
622
1
11,015


Ok ...........FX
 

Mephikun

Distinguished
Jan 8, 2013
374
0
18,960
AMD:

PCPartPicker part list / Price breakdown by merchant / Benchmarks

CPU: AMD FX-6300 3.5GHz 6-Core Processor ($109.99 @ Amazon)
CPU Cooler: Cooler Master Hyper 212 EVO 82.9 CFM Sleeve Bearing CPU Cooler ($29.98 @ OutletPC)
Motherboard: Asus M5A97 LE R2.0 ATX AM3+ Motherboard ($73.99 @ Newegg)
Memory: Kingston XMP Blu Red Series 8GB (2 x 4GB) DDR3-1600 Memory ($64.99 @ Amazon)
Storage: Western Digital Caviar Blue 1TB 3.5" 7200RPM Internal Hard Drive ($49.99 @ Amazon)
Video Card: MSI Radeon R9 270 2GB Video Card ($184.99 @ Amazon)
Case: Corsair 200R ATX Mid Tower Case ($49.99 @ Newegg)
Power Supply: XFX 550W 80+ Bronze Certified ATX Power Supply ($49.99 @ NCIX US)
Optical Drive: Asus DRW-24B1ST/BLK/B/AS DVD/CD Writer ($19.98 @ OutletPC)
Total: $633.89
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2014-04-18 02:16 EDT-0400)

Intel:

PCPartPicker part list / Price breakdown by merchant / Benchmarks

CPU: Intel Core i5-4570 3.2GHz Quad-Core Processor ($189.99 @ Amazon)
Motherboard: Gigabyte GA-H81M-HD3 Micro ATX LGA1150 Motherboard ($58.48 @ Newegg)
Memory: Kingston XMP Blu Red Series 8GB (2 x 4GB) DDR3-1600 Memory ($64.99 @ Amazon)
Storage: Western Digital Caviar Blue 1TB 3.5" 7200RPM Internal Hard Drive ($49.99 @ Amazon)
Video Card: MSI Radeon R9 270 2GB Video Card ($184.99 @ Amazon)
Case: Corsair 200R ATX Mid Tower Case ($49.99 @ Newegg)
Power Supply: XFX 550W 80+ Bronze Certified ATX Power Supply ($49.99 @ NCIX US)
Optical Drive: Asus DRW-24B1ST/BLK/B/AS DVD/CD Writer ($19.98 @ OutletPC)
Total: $668.40
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2014-04-18 02:20 EDT-0400)

Build one of those, you will be beyond happy with them. The FX-6300 build will be cheaper and you can overclock it a fair bit. Up to you.