Assuming you aren't sitting 2 feet from the TV and aren't bothered about sync tech..... 1080P @ 120HZ on the 2017/2018 LG models is fantastic and should fix any of the issues with input lag etc. that most people always dislike about 60HZ displays.
Myself and a number of other friends have commented on how disappointing 4k is compared to 1080P in media and more so game related content (unless the media/game is specifically made for 4k or/and using proper 4k assets) when sat the appropriate distance of 7-8 feet from the TV, so much so that the only time my TV ever switches to 4k is when viewing content on netflix, although I might even start to limit the res. to just 1080P for that now as well) EDIT: And of course, UHD films, but I get these solely for the HDR part.
Also, the nvidia 65" display will be far more than £2k, the last price rumour was £5k iirc (especially when these 27" displays are going to be costing £2k)