I have chosen AMD 3.5 AM3+ FX 6-Core Edition FX-6300 as my processor (95 watt), my gpu will be Sapphire AMD/ATI Radeon R7 250 with Boost 1 gb ddr5 ( 500w) , Gigabyte GA-970A-DS3 Motherboard . I don't know which cabinet and power supply is needed . Please suggest me some in the lowest range possible but one that will work .