For truly light gaming APUs make a decent choice, then you don't need a video card at all. What are you looking to play primarily?
Mostly mine craft,gmod, and some other small steam games. Oh and also what would be a good processor? I have the AMD FX-6300 Vishera 6-core 3.5ghz (4.1ghz turbo) Socket AM3+ 95W Desktop Processor in mind.