For a $1k budget you're better off with a single card, like a 4870 or a 4890. SLI/Crossfire is more noisy, more expensive, and eats more power. Also, 2 cards doesn't mean twice the performance, there is about a 50% increase from 1 card to 2.
+1 for Outlander don't get an SLI chipset, go with a 790gx chipset and just use the ATI equivalent GPU's, its a much more stable and overclockable platform.
Your link just takes people to their shopping carts, no one can see your build. Leave links and item descriptions so we know what you are looking at.
I would go with AM3 790FX or 790GX type of motherboard with ATI video card. The memory same brand you what is the DDR3 1333 is $10 cheaper. It better to upgrade with a different CPU and faster memory in later.