Will this psu be sufficient for these components and another Radeon hd 5850 down the road?

According to AMD ( a href="http://www.amd.com/us/products/desktop/graphics/ati-radeon-hd-5000/hd-5850/Pages/ati-radeon-hd-5850-system-requirements.aspx" rel="nofollow"http://www.amd.com/us/products/desktop/g…/a ) the minimum requirements for Crossfired 5850s is a 600w PSU. So I'd go a little bigger and be safe?