Power supply unit help?

Solution
Here is an image of the connectors on the supply:
http://www.techpowerup.com/reviews/EVGA/SuperNOVA_G2_850/images/psu_modular.jpg

You can run two graphics cards up to 250W with the supplied cables and the rating of this power supply.
There are enough connectors to run up to 12 sata devices with the available connectors and supplied cables. If you were to run say 10 mechanical hard drives though I would stick to a single 250W graphics card or two cards under 200W each.
Here is an image of the connectors on the supply:
http://www.techpowerup.com/reviews/EVGA/SuperNOVA_G2_850/images/psu_modular.jpg

You can run two graphics cards up to 250W with the supplied cables and the rating of this power supply.
There are enough connectors to run up to 12 sata devices with the available connectors and supplied cables. If you were to run say 10 mechanical hard drives though I would stick to a single 250W graphics card or two cards under 200W each.
 
Solution
I'd reserve the "best" moniker for the Seasonic X Series but ..... the EVGA P2 / G2 models as well as the Corsair HX (650-850) / AX series and Seasonic m12 series come perty darn close and th e G2 is the least expensive of those.

I'd feel comfortable with a quality 850 watt PSU on any two single GPU cards made today.
 


They list all of the supplied cables, but you can't connect all of these to the supply at the same time.
The supply has 4 PCI-E connectors, so you can use up to 4 of the various PCI-E cables provided.
The supply has 4 Peripheral or SATA connectors, so you can use up to 4 of the various peripheral or SATA cables provided.
This is likely enough for anything you want to run on an 850W supply.