Hi benfretz13, if you want to keep the Athlon X4 860K and the ATX format mb, you only can get the Asrock FM2A88X Pro3+ for over $70, because other low price MB ( like the FM2A88X+ BTC ) you need to update the BIOS first, otherwise the MB is not compatible to the x4 860K.
Here is the cpu support list for Asrock FM2A88X Pro3+
http://www.asrock.com/mb/AMD/FM2A88X%20Pro3+/?cat=CPU
And I come up other almost same built like Eximo, but I will change the CPU to athlon x4 760K with ASRock FM2A88X Extreme4+ and the other r9 280 SAPPHIRE DUAL-X 14-202-099 Radeon R9 280, and yes, you need the aftermarket cup cooler.
Or even to get the Pentium G3258 and asrock H97 Anniversary
http://www.newegg.com/Product/Product.aspx?Item=N82E16813157564 for almost same price range and same performance. Review:
http://www.tomshardware.com/reviews/pentium-g3258-overclocking-performance,3849.html
Here is my list.
PCPartPicker part list:
http://pcpartpicker.com/p/HG72zy
Price breakdown by merchant: http://pcpartpicker.com/p/HG72zy/by_merchant/
CPU: AMD Athlon X4 760K 3.8GHz Quad-Core Processor ($74.98 @ OutletPC)
CPU Cooler: Zalman CNPS10X OPTIMA CPU Cooler ($19.99 @ Newegg)
Motherboard: ASRock FM2A88X Extreme4+ ATX FM2+ Motherboard ($60.99 @ Newegg)
Memory: G.Skill Ares Series 8GB (2 x 4GB) DDR3-1866 Memory ($73.80 @ Newegg)
Storage: Seagate Barracuda 1TB 3.5" 7200RPM Internal Hard Drive ($53.98 @ OutletPC)
Video Card: Sapphire Radeon R9 280 3GB Dual-X Video Card ($164.99 @ Newegg)
Case: Cooler Master HAF 912 ATX Mid Tower Case ($44.99 @ Micro Center)
Power Supply: XFX 550W 80+ Bronze Certified ATX Power Supply ($25.99 @ Newegg)
Optical Drive: Samsung SH-224DB/BEBE DVD/CD Writer ($14.99 @ Newegg)
Total: $534.70
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2014-10-31 16:36 EDT-0400