I wanted to post back on this and let you know that my PSU recommendation was not adequate for your needs. I mistakenly bought this PSU intending to get a 600W 80+ Platinum TT supply and have since RMA'd it to Newegg for a 650W G-Series Seasonic, which is 80+ Gold.
To explain, I know the requirements of my system are minimum ~525W with my 7870. An 80+ Gold gets me there and Seasonic received great reviews on this series, including [H] Ed. Gold.
That said, I recommend for today's cards you go minimum 650W with the system you've described and make sure you're getting at least an 80+ bronze-rated supply. If you're not running at least 650W @80% efficiency, you're not guaranteeing that card has the juice it needs under load.