If you want to go SLI then you are going to have to go with a Nvidia chipset. The 790i's are a little out of your price range so I would go for something like the EVGA you suggested or:
But the Nvidia MoBo's don't oc well, they suffer from high NB temperatures,so you would probably have to get a north bridge cooler if you wanted to do an heavy duty over clocking.
Alternately you could just not go SLI at all (which is what I would do) and get something like this:
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