Good build but you could go with 16GB of RAM and 1440p is nice but kind of expensive and the NZXT Phantom 410 would work but I would recommend a bigger case and SLI is not needed in the build right now and SLI depends on your motherboard.
You could also change to a halfway decient mouse and keyboard go with like a corsair K70 and maybe a Deathader chroma or something along those lines or maybe a logitech G910+