Save up your money.. Buy a graphics card when it is first released, and enjoy it! The GTX 980 had a life cycle of nearly 2 years before the GTX1080 was released. And the GTX980 is still fast for gaming! Especially once Overclocked!
I love my Nvidia GTX1080 Founders Edition! I've adjusted the default fan profile a little, send some air flow it's way, from my case fans. Overclocked it to 2128/11,400 memory. And it is a screaming demon! And, I plan to use it for it least another 18 months.
I can play 4K, and enjoy it, with a very smooth experience!
The Titan X Pascal is great! It is 15-30% faster than a GTX1080. But, you've gotta pay to play! I could hardly afford my GTX1080. If I could afford a Titan P , I would buy it in a second!
Bare in mind though, you can overclock a GTX1080 Founders Edition to roughly 20% more performance out of the box.
Happy life, happy gaming, happy overclocking, this is what it's all about people!