So currently I have 2 EVGA GTX 1070 Sc graphics cards in SLI but I've been thinking perhaps I should sell my cards and just get a EVGA GTX 1080 FTW2 or try to find a good deal on a EVGA GTX 1080 ti FTW3 card on Ebay. I game at 1440p -always lol and my setup has allowed me to run any game on ultra/max settings with 60-120+ fps depending on the game. I've dealt with a certain individual on Ebay and I'm certain I can get $600 for my cards but I can only contribute about $100-150 on top of that to buy a new card if need be. This thought has been bouncing around in my head for a couple weeks now and thought maybe I could get some helpful ideas or advice as to what I should do. I've also thought about waiting it out and snatching 2 1180s or 2080s if they become a real thing but I wouldn't be able to do that until February of 2019. My other relevant specs are that I have a i7 8700k, EVGA z370 classified k mobo, 32gb of corsair ddr4 ram (3000), and a 1k watt psu. Ideally I'd like to be gaming in 4k 60fps in 2019