SLI or Crossfire: Maybe, but I would prefer to go for a better single card configuration so I can upgrade later to a dual.
Monitor Resolution: 1920x1080
Additional Comments: Since I'm getting back to Brazil with the components I would favor buying parts from reliable brands and reliable sites because it will be a pain to activate warranty or support from abroad.
Not a bad build. The two flaws I can see is the mobo..if your going to run SLI that is. One of it's PCI-E lanes is 16x, but the other one is only 4x. You want a board that runs two cards @ 8x & 8x when running dual cards.
RAM - The G.Skill RAM isn't better. It's slower and more expensive. That's a great deal for the Corsair. If the sale ends before you can get it though, just go for whatever's the cheapest DDR3 1333 or faster you can find at 1.5V.
PSU - That one's fine if you're not going to SLI. If you want to be able to SLI, I'd suggest bumping up to the 750TX or equivalent.