You'd be surprised what constitutes a "quality" power supply.
Antec has some great units that won't burst your bank account wide open, I often use their units at work and in home PC builds.
Corsair and Seasonic are my default "high end" builds, but I've also used Thermaltake and Cooler Master units.
It's never worth buying a cheap power supply. Save up the dough if you have to, but never skimp out on a cheap power supply. The potential for them to ruin everything
is just too great.
Antec has some nice 530 watt units that'll run the cards you listed just fine.