PC cabinet? I'm gonna go ahead and presume you mean a case.
Get a NZXT Gamma Classic, and one extra each of a 120mm fan and a 140mm, for front intake and top exhaust - it's gonna be cheap, and have better cooling than any comparable case. (Though you'll have to make or buy a dust filter for the intake.)
As for the PSU, I'd get a Corsair HX-650.