help find a quiet psu

If you're not playing games, and you have a single video card, then a 520HX would be fine, or a 550VX. The P5Q-E is overkill in this case.

Are you going to play games on this PC too?

I'm going to use just a single video card and no game play. The p5q is overkill for a DAW? How do you figure? I want the best board and most future proof as possible for a digital audio workstation between $200-$300

I recommend the Corsair by far of my experience with the Antec PSU. However the best reliable and quiet PSU I have ever owned are the Thermaltake Toughpower Series, and also they maintain very efficient power, and covered by a 5 year warranty, and they are very quiet. I can never hear it over the case fans.

Depending on your needs the ToughPowers also have surge protection as industrial grade compacitors. There is a huge difference between the Pure Powers that are also very nice PSU which are 80% efficiant which cost less but the are only covered by a 1 year warranty.

The ToughPower Series at 87% efficacy are:
1. 1200W Model: W0156RU (which I have) down to a 850W Model: W0131RU

Also ToughPower Series also make models that are 85% effiancy:

a 600W Model: W0103RU, to 750W Model: W0116RU