graphics card advice

I currently have a GTX 980 and saving to build a new gaming rig what are the best cards to buy that is better than the GTX 980 atm?

I built a PC this year, and for a while it worked very well. It runs everything fine. About a month later, it crashed for the first time. It continued to crash every now and then until it got to the point where now it won't boot up properly; it restarts in the middle of the splash screen and I...