Budget PSU?
Yeah go ahead!! I don't believe in expensive PSU either. As long as your PC is not loaded with too many peripherals, go ahead man! Too many peripherals could lower 12v lines and consequently it hurts the 5v lines.
My setup: 3 hardisks, 1 cd-rom, mobo & proc., 3 pci cards, all of these are working fine with a generic 350 watts PSU. The voltage are: 3.26v, 5.02v, 12.40v under load.