I won't bash you for wanting to buy an 850w PSU becuase honestly at the rate we are going it's not a bad idea to buy a little more watts than you need considering with quad-cores and dual quad-core mobos and tons of drives and power hungry cards. If you buy a PSU thats expensive you might as well buy one that will be able to power systems for the years to come...or buy one cheap that will run your system effectivley until you buy a new rig. Since you have the money 850w is very future proof and i won't bash you. HOWEVER I would choose this PSU over an OCZ one.
Newegg.com - XCLIO GREATPOWER X14S8P4 850W ATX12V / EPS12V Power Supply 100 - 240 V CE, TUV, cUL - Power Supplies
Xclio are known to make very good PSU's for the money and they have had a better track record than OCZ. Also if you look the amps on the Xclio seem to be more than the OCZ which has 4 rails of 20 each combining to 80 amps at around an 85% efficieny meaning lrobably close to 65 amps on the 12's which is a lot buy not as many as Xclios combined 96 with an 80% efficieny putting out probably around 75 amps at the same amount of watts on the 12 volt rails. This is not formula for it however it is a good guess. I am a fan of Xclio for being an amazing PSU for their value ever since the once gone Xclio 450BL supply which dusted the Fortron 450w at 10 bucks cheaper and more stable rails.