Really it depends on what resolution or refresh rate your going for. Personally my GTX 1080 just barely manages 1440p 60fps High much less 144hz or ultra settings so I'm shooting for a 3080 3080ti or 6900xt

best option - 3080 / 6800XT    -> or 2nd option   3090/ 6900XT 
 
But good luck finding any of those for under 2 to  2 1/2 times retail costs 

I'd say minimum 3070. Currently running a 1080ti on a 144Mhz Gsync monitor no problems.  Good luck!
Of course you should have a decent enough CPU as well. I'm using an i7 8700k. I bit long in the tooth but works quite well!

smellyunicorn
I have the 1080 SC2 honestly I say wait for the 3080TI. Issue with my 1080 is its VRAM usage is strange. I'd have a game use only like 5GB of it but the utilization would be near 90%. I'm personally trying for a 3080(TI). 
With the issues with supply I dont think PC games are going to be graphically demanding anytime soon. So the 3080 will get you high frames at 1440p and should be good until at least 2028 (next console generation should be around the corner then and new technologies would be baked into those cards (ie like DLSS or RTX) which is what I truly wish I had on my 1080.
 

IDK about 2028 lol Thats a bit of a stretch. Maybe 2025

Thinking the 3080Ti will be the sweet spot. AMD claims it will be shifting more FAB to VC but then again
they said we have plenty of cards at launch and we saw how that's gone!!
 

Would love a 3080TI

There's nothing wrong with a 2080super... besides the prices for em right now. Anything below that isn't really much of an upgrade from a 1080, so since even just a 2080super costs so much right now, just try your damndest to get a 3070 at msrp or try to snag a "good" auction on one, but you're not likely to walk away with a 3070 from the scalper market for anything less than $1300-$1400 right now, maybe try and get the dell one, as they are selling for less than all the rest, until you are able to get the one you want. If you are looking to get a whole new system, you can just buy a whole prebuilt with a 3070 in it, it's expensive, but so is the scalper market. 

aka_STEVE_b
best option - 3080 / 6800XT    -> or 2nd option   3090/ 6900XT 
 
But good luck finding any of those for under 2 to  2 1/2 times retail costs 

+1.... Just sit tight and maybe mod your 1080 to run a little cooler and pull more out of it for now. I cannot convey how hard it is to get your hands on a card. You need friends/family in high....or interesting places at least to have any hope. The crypto market will be crashing soon, most likely around september-ish, give or take, from what ive been hearing so some things may be changing then. Unless your rich and want to put loot in scalpers pockets and perpetuate the nonsense thats going on, im sure a 1080 can get you by for awhile. Thats a damn good card.

Just get what ever you can get your hand on. 3070 is easier to get comparing to 3080.

How about a 3070 if you could find it

Right now, not a good idea to upgrade unless you sell your 1080 ti. If you just want more frames, you will probably want something high end, which is overpriced right now.

There are only a few graphics cards better than 1080 ti right now.


2080.. barely
2080 Super
2080 Ti
3070
3080
3090
6900 XT
6800 XT

Would Go for 3080 or higher

Im in the same boat as u and what im trying to get is a 3080. Its literally perfect for 1440p and like some people already said its gonna be more futureproof than 3070 for sure so that might save u some money in the long run

OhmicFutility
According to UserBenchmarks when comparing overall scores to a 1080:
3060 (-9%)
3060ti (+21%)
3070 (+30%)
3080 (+45%)
3090 (+116%)  This one seems suspicious to me… but I don’t have any data to disprove it.
While the specs have not been officially announced, if you are limited to 1440p gaming, it may be worth considering the 3070 ti as well.  At least I would not go any lower than that if you want to see a reasonable upgrade. If you are going 4k then you probably want a 3080. 

Alot of places ban for posting user benchmark. Evga doesn't. Place is full of bad data. Cool of you to help but user bench is badddd and I want to give you a friendly heads up before you get flamed out for it lol.

with a new 3080ti I am hoping for solid 144fps in 1440p, 1080ti does not quite get it