Future proof is a stupid term...
will last a few years though before upgrades are needed..
3K on a build and only a 250GB SSD... shame

Well, $300 for that Razer headset? Waste of money. Mouse is meh, but the keyboard is a waste of money. Grab a K70 RGB or something. I'd get an Enthoo EVOLV over a Switch 810, but a Define S or H440 would be more than fine for you. No need for a full sized case. Motherboard is a waste of nearly $100 since you can get a good quality motherboard with the features you'll use for about $120. You won't need a 1000W PSU. 850W is enough for SLI 980Ti's, and you can get a great quality 850W unit for $100 less than the Seasonic unit. Waste of $60 on the HDD IMHO. 3TB Barracuda's are about $90(I think) and will do perfectly well. What will the rig even be used for? You might not even need the 97 and 16GB RAM. What monitor are you using? I really hope you're not using a 1080p monitor, because the GPUs would be an absolutely huge waste of money. Shit, even at 4k, SLI 980Ti's are more than enough GPU power. I'd expect at least a 500GB SSD in a rig that expensive. I wouldn't be paying for OS.