There is never going to be any reason to SLI a 650 - the Corsair CX430 will be enough for what he had now, and would be enough to upgrade to a slightly better card like a 7850 or 660 as well. The CX 500 linked above at $30 is a good deal though. I like the NZXT Source 210/Source 210 Elite for cheap builds but it seems to be a little more expensive than usual right now. $50 at amazon but I've gotten the elite for a little under $30 after rebate before. I've actually got two of them, one housing a i7-3770k/Biostar TZ77A/4x8gb G-Skill/2x3TB Seagate Barracuda that I use as a Linux KVM Server and another with an A10-5800k/Gigabye F2A75M-D3H/2x4gb Samsung 1.35v/XFX 7850 1gb.
Obviously not as good as the Corsair 500R I have on another system but pretty good for the money - room for cable management, good thermals, space for a lot of 120mm fans.