Look for a PSU that is on this list.
Honestly, you dont need more than 650W so long as it is a good unit. I would take a look at the SeaSonic SSR-650RM for $75, before MIR, $60 after MIR.
Honestly, I would look into the OCN marketplace for a used card, and just look for the best card available.
There are tons of cases that have good cable management. Some that I can recommend are the Fractal Design Arc Midi R2, Fractal Design Define R4, Phanteks Enthoo Pro. What kind of case are you looking for, and what is your budget?