Looking to upgrade GPU...could use some suggestions/help

[SSG Cherry]

My GTX 760 was supposed to be a temporary card until I could fund something better. Did so much better than I expected that I haven't bothered to change it but I'm falling behind in the GPU arms race obviously. Now I was looking at 970s, then I saw 980s, finally saw the 980Ti and I was torn between cost/performance. I mean I could spend for a Titan if I wanted to but I don't know if I could sleep well at night spending 600+ bucks on a card. I'm hoping to be 1440p ready for when I start shopping for a serious monitor. I'm still learning the ropes when it comes to PC building/upgrading and was hoping you guys could also double check compatibility and what not to make sure I'm not messing anything up (Especially mobo since I didn't select it).

Current Rig (Win10 64bit)
Processor: i7-4820K (No OC)
RAM: 16GB Corsair Vengeance Pro @2400mhz
GPU: GeForce GTX 760
Cooling: Corsair Hydro H60 (6 or so case fans)
Motherboard: Gigabyte X79-UP4 (LGA 2011) <- This is what I'm most worried/confused about
Power: 800w (Unsure of exact brand)

Let me know if you need more details

[Bingham]

I'd say your fine upgrading but if you want check out PC Part picker, it will let you know if some parts are incompatible, its a great website.

[Barraco]

ya go to part picker. due to cost factors, i just upgraded my gpu for a gtx 960 SSC 4gb ram and was blown away by its performance.... and i picked it up for $200 off amazon on sale. i would say a 970 or 980 is more than enough. im now running arma anywhere from 40-60 frames. on top of that my cpu is an older i7 920 overclocked to 3500Ghz so its not the newest or latest by any means.