...what model of i7? Guess it doesn't matter i7's all cost an arm and a leg anyway.
I would suggest getting an ivy bridge board for the PCI 3.0 ability (which a 680 will take advantage of) and other doodads like native USB 3.0 and such.
I've been going with ASUS for years and they haven't let me down. Gigabyte would be a secondary choice and MSI after that.
AsRock also seems to be pretty popular but I haven't used a single product of theirs.

Corsair PSU's are horrible on the low level and all their models only have one 12 volt rail, that dies and poof psu evolved into paperweight.
Not that this is common but I'm paranoid
Prefer Antec myself.

For SLI, you shouldn't need anymore than a 850watt these days. This is especially true with the crazy power consumption numbers that the HD7000's and g600's are getting.