AMD FX 6300 CPU
ASRock 970 Extreme 3 board
2x4GB 1600 or 1866 RAM
R9 270 or similar GPU
Reputable 500-650w PSU
Case of your choice with good ventilation on front, side and top.
Storage of your choice
PCPartPicker has been crawling for me lately so it will take a LONG itme to pull these for specific $ amount. But this should be close to $550.