I am building a pc that I have been working on buying parts for. I have a 600w power supply, 12gb ddr3 2x4gb and 2x2gb. I have my case, 1tb HDD and 240gb ssd. I am planning on buying a gtx 1050 and with that I would only need a motherboard and cpu. I have about $100-150max I'd be willing to spend on a used motherboard and cpu. I don't play much video games, but I'm branching out into the world of gaming, and that's primarily what this is going to be used for. What would be some good choices?