Which power supply should I buy for sli 580s?

[gtechfan2008]

after looking at other threads, I heard that seasonic is the best brand.

I have come to this:

SeaSonic M12II 850 SS-850AM 850W ATX12V / EPS12V SLI Ready 80 PLUS BRONZE Certified Modular Active PFC Semi-modular Power Supply
http://www.newegg.com/Product/Product.aspx?Item=N82E16817151108

only problem is that there are no reviews because it is a newer model.

Should I buy it? or is a 750w OCZ good enough?

 

[gtechfan2008]

http://www.newegg.com/Product/Product.aspx?Item=N82E16817121069

or this?

 

[davcon]

Two 580's can eat-up alot of power,i'd choose a more powerful unit.
If you plan on overclocking the cpu and the 580's you'll need it.
A 750W psu is underpowered for 580sli.
An 850W is cutting it close if you plan on tweaking oc performance.

 

[gtechfan2008]

more powerful than 850 watts?

 

[davcon]

more powerful than 850 watts?

Yes if you plan on overclocking.
PC Power and Cooling Silencer Mk II 950W
http://www.newegg.com/Product/Product.aspx?Item=N82E16817703028
OCZ Z-SERIES 1000W 80+ Gold
http://us.ncix.com/products/?sku=44873&vpn=OCZZ1000M&manufacture=OCZ%20Technology&promoid=1055