Okay, so my current pc is an i5 4690k, MSI z97 PC Mate mobo, 1tb HDD(planning on getting a small SSD soon), 8gb 1866 Mhz ram, and a GTX 970. I haven't gotten my PSU yet, because I'm not sure what size I need. I would like to keep it around $60, and modular would be nice, but isn't mandatory. So...