A decent graphics card will probably require more power than the 220 watts. I heard that Seasonic makes TFX power supplies that are decent. Zotac makes a low-profile GTX 650, and that's about the best that can fit except the Sapphire HD 7750 (but that is from AMD). Be warned, however, that you will need to remove any other expansion cards to make the graphics card fit, as the GTX 650 screws onto one slot, but is actually two slots wide.
This is what it looks like:http://www.amazon.com/Zotac-GeForce-Express-Graphics-ZT-61008-10M/dp/B00BM1PA9C
The HD7750 is cheaper and is around the same performance level as the GTX 650. This model only takes up one slot.http://www.amazon.com/Sapphire-Profile-PCI-Express-Graphics-11202-10-20G/dp/B0095MRLJ2/ref=pd_sim_sbs_pc_1