Planning on buying a new pc. Need help on choosing a GTX 970, R9 390 or R9 390X. I want a video card that is futureproof for the next 3 years and if it comes to the time when it can't hold up to games by itself, I'm planning on an SLi/CrossFire configuration. Also, although I'm playing in 1080p now I plan on upgrading to 1440p when it's become more common so that is a key factor as well.