Hi Stevo
If you will be upgrading your video card in the near future I would make the move. I see that as being 1080 Ti's turf. When a monitor is purchased for gaming the circle of hardware needs to have a balance. Nobody can be getting ahead or behind one another. This you know but others may not. To keep up with a 1440p 144Hz monitor the PC needs to be sending 144 frames per second down the pipeline to the monitor. Can your PC do that on all the games you currently play?
The PC can't unless you just play a few lower end games which seems unlikely, so you need to invest an extra $200 or so for G-sync which certainly adds a hefty price increase. That's cheaper than investing in a 1080 Ti. That means that I think you're making a smart and informed upgrade.
For maybe $100 or or so more you could first purchase a 1080 Ti and then buy the monitor without G-sync price hike with all your other preferences and save some money in the long run. It's just a possibility. You then sell the 1080 and recoup a nice chunk of change at the end of your upgrade journey. To be clear I am not suggesting you do this all at once unless you can. But over time you'll come out ahead. A monetary return on patience?