First thing is to verify that your HP psu does not use a proprietary design the way that many Dell systems do.
There is no such thing as a quality, quiet power supply that is cheap.
You will also need a psu that has two 8-pin pcie power cables for your video card.
I suggest buying a name brand 650 watt psu.
A power supply is the foundation of your system, don't buy a cheap one that might nuke your system if something goes wrong.
If you are a Newegg email subscriber, you will sometimes find an excellent sale price on 650 - 750 watt Seasonic and Rosewill 80 PLUS gold rated power supplies for about $100. These sale prices are usually available for only one or two days. Three weeks ago, I ordered a Seasonic SS-660XP Platinum rated psu for $90 after rebate. Check out JonnyGURU - Seasonic Platinum 660XP 660W Review
Check out P67 Extrme 6 Intel, Giving error 36 or 62 and freezing., post #6 for some psu recommendations.