Is the 6800 non XT worth the price increase over the 6700/6750xt?

I'm currently running a rx580 (with a 5600x and 16gb of ram), and its finally starting to show its age and not be able to run at the settings i would prefer, at the frames I would like.

This is a card I'll probably, barring its sudden demise, be sticking with for the next 5-6 years, So keep that in mind too. I know vram demand in games is on the rise too, even for 1080p, which is why I have not considered any 8gb cards like the 6600 or the 7600.

I've narrowed my choices down to the 6700xt, 6750xt and rx6800 (non-xt). Which will be used almost entirely for 1080p gaming (maybe 1440p if my current monitor dies and I'm forced to replace it)

6700xt is attractive simply because its the cheapest. 6800 is attractive cause its more powerful, which I would hope means I'd get a bit more extra time out of it.

6750xt is kinda stuck in the middle.. -100ish bucks cheaper than the 6800, but also 70-90ish bucks more expensive than the 6700xt, and from all the reviews I've seen, it seems like it only averages around a 5-8fps boost over the 6700xt which doesn't exactly seem worth the investment?

This is where I need the advice of those who are more experienced/knowledgeable than I am.

Would the 6800 have enough horsepower to be viable long enough after the 6700xt/6750xt hit their limits to be worth the price jump, or Should I save 100 bucks and get the 6750? Or should I just go straight with the 6700xt and save almost 200 bucks?

My gut is telling me 6700xt, but I'd like some outside, hands on experienced opinions, if you'd be so kind to give them, before I can quash the debate in my head.