So, I am quite new to the whole computer building subject. I am building a new PC in the next few months. I plan on putting a Intel i7 6700k ( or 5820K, still deciding), still choosing the mother board, 2 Gigabyte GTX 980 ti WindForce in SLI, Corsair Vengeance 16 Gig Ram, 750 Watt Corsair PSU, 1 TB WD Black, 500 GB Samsung SSD, CableMod sleeving, all in the Corsair 780t Case. I am wondering whether the 2 GTX 980 ti's ($1300) will last me for atleast 3-4 years. I'm not the kind of guy who has $1500 to throw away every 2-3 years.If I'm spending that much money on 2 parts, I would want it to work with the latest applications and games of, let's say, 2018/19. If not, should I get 1 GTX 980 ti then later down the road upgrade it with maybe, I don't know, 1080 ti's in SLI (lol)?