here a list of very good psu´s, but ofc there are many more good brands, just make sure you but a 650W/750W 80+ Bronze or better, and take a good brand, like Enermax XFX seasonic Coolermaster some crosair models. EVGA
Check out Tagan, it's a lesser known Taiwanese brand that does a lot of OEM work for redundancy critical systems, but also have a small desktop line. In all tests I've done with an oscilloscope, they have been the PSU's with the most constant sine wave. I have used them for my systems and for customer's systems for years (about since 2005), and not one single PSU has given problems (knock on wood). Especially if you use internal audio solutions and you want superior audio quality, and want to overclock quite a bit, Tagan is a really good choice imo.