1080Ti 11GB version. I have 3 different kinds actually (technically 4 total as 2 cards are identical, but 3 different manufacturer models of it):
The crown jewel in my opinion is my lone EVGA Hybrid SC 2 AIO model (with upgraded fans - Noctua iPPC 3K RPM in push/pull) I have in my well, what used to be, my LAN PC, for Rocket League and other tournaments, prior to COVID.
I also have twin ASUS OC air-cooled versions in SLI configuration for my Living Room Setup. That PC runs a significantly older CPU so I had to pump some new life into it with those. It works really well, considering I run 1080P on my TV (for lowest input lag plus 120Hz - 4K gaming on my albeit, early adopter 4K TV, provides no gaming benefits and too many disadvantages to make sense). I know soon that CPU will become a major bottleneck, as on some new AAA titles it shows it's age, but it will be a costly upgrade that in these unsure COVID-times, I can't afford anytime soon.
The 3rd one I have is a Zotac 1080Ti Mini in my 1080P Plasma TV Bedroom PC Setup, which is totally overkill, as I designed that PC primarily for streaming movies + general computing needs for me and my girlfriend, but has proven useful when she wants to play some new-ish games like Watch Dogs 2, Tekken 7, OverCooked 2, among others. Again, another CPU that while not old, isn't particularly tailored for a high-level gaming experience, but functions for exactly what we could ever need from it, because the GPU is so powerful.
Bottom line is Nvidia's 1080Ti, in my opinion, (ALSO AT THE PRE-Mining Craze MSRP I PURCHASED THEM ALL AT [that's a major caveat considering what they cost post]) was/still is the best price/performance ratio card they ever released.
These cards are still not showing their age going into what soon will be 3000-series cards, provided you game at 1080P/1440P and don't have HDR-enabled monitors or care for RTX. They also function well in multiple monitor environments and WQHD monitors. I powered an Alienware 3418DW on my lone AIO card and it ran spectacularly at 80-120HZ, depending on the game. When that monitor broke in a move, I opted for 3 Dell S24DG17s + 1 S27DG19 (as AUX) and it runs all of them well in Surround mode (the 3 S24's for gaming purposes) and when I run them all individually (for work purposes). I literally have nothing negative to say about those cards. At an average of $750-$800 I believe it was at the time, it was considered high but I'm so glad I got them when I did, because as much as I love those cards, they are not worth the $1,200+ they started costing after the Mining craze destroyed our beloved industry. Even in 2020, in the scenarios I listed above for 1080P/1440P G-Sync enabled gaming, I would recommend someone buy a second hand (but try to ensure it wasn't used for mining) 1080Ti rather than a 20-whatever. I don't think those 20__ cards offer a particularly good bang for your buck. Again, especially when you consider that in these COVID times money isn't as easy to come by as it was even 7 months ago and with the world in flux, big expensive unnecessary purchases aren't exactly atop anyone's shopping list.