The power rating is important. How many of each different connector there are.
It depends on how far you are going to expand the system.
In any case, don't go for a rock bottom price PSU. It will end in tears.
My favourites at the moment are the corsair HX, if you want modular cables:
http://www.corsairmemory.com/corsair...er_supply.html
Or
the Antec TruePower Trio, if you want captive cables:
http://www.antec.com/uk/productDetails.php?ProdID=07656
Both are SLI certified by Nvidia, come with a Five year warranty and are originally by Seasonic. One of the best PSU companies in the world.
Check a few PSU reviews to get a better idea what's out there and make an informed choice, though any of the above will serve you well.
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