http://www.newegg.com/Product/Product.aspx?Item=N82E16819113359 AMD A10-7850K Kaveri $170
http://www.newegg.com/Product/Product.aspx?Item=N82E16813130755 MSI A88XM GAMING $105
http://www.newegg.com/Product/Product.aspx?Item=N82E16822148840 Seagate Barracuda 1TB $55
http://www.newegg.com/Product/Product.aspx?Item=N82E16817152055 RAIDMAX Cobra Continuous 700 watts $65
http://www.newegg.com/Product/Product.aspx?Item=N82E16820313418 Team Vulcan 8GB 2133mhz $69
Total $464. Use the discrete graphics until you can buy a r9 270 or r9 280 and i got you a power supply that can handle a overclock with Crossfire.
Of course you need a case and you should add another hard drive later for the page file.
If you overclock the cpu you will need minimum Cooler Master Hyper 212 EVO.
AMD is advancing The A-series line for gaming and i have read about plans for 8 threads on the cpu side but you will not be disappointed with the current 4 threads that will let you run 28nm parallelism with your powerful gpu's
You will need a little more money to get running and you could go a little cheaper on the motherboard but it will be worth it.
(i did not have my coffee yet and forgot the ram but i updated it haha)
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DO not go with this, as you wont be able to uprade this AT ALL