Nice build
I'd recommend at least a tier two PSU, such as the XFX TS 550w or 650w. They're manufactured by Seasonic, a leader in power supplies. If you want to SLI in the future, consider getting a 750w PSU. The EVGA B2 Supernova is a reliable and affordable tier two unit, manufactured by Super Flower (another top-notch manufacturer). Avoid the Corsair CX/CS series and the EVGA 500b and 600b at ALL COST, especially for a high end build like yours as they're all garbage. It's not worth taking the risk. Take a look at the PSU tier list:
http://www.tomshardware.co.uk/forum/id-2547993/psu-tier-list.html
*Edit: The EVGA Supernova B2 750w is an absolute steal right now, $49.99 after $30 mail-in rebate. Although 750w is an overkill for your current build, it doesn't hurt to have more and will leave you with headroom in the future for SLI. https://pcpartpicker.com/part/evga-power-supply-110b20750vr