That's a nice budget, I'm sure you can get a pretty awesome TV for that. But since you didn't mention size, it's hard to give you much guidance. For example, you might be able to find an "entry-level" 82" for $1800, or a mid-range 65", or a higher-end 55". So size is probably the first hurdle.
You don't mention gaming, so that probably makes things easier. For gaming you need specialized TV's with low-latency modes, variable refresh rates, and higher refresh rates. They like to charge a lot more for those features, so hopefully you don't care about that.
For 4K UHD Blu-ray, your primary concerns are: 4K, HDR, Contrast, and Color Gamut/bit-depth.
4K is pretty self explanatory. No reason to buy a non-4K TV these days, and you won't get HDR without 4K anyway.
HDR is a big ol' mess. You'll find that there are actually multiple HDR standards: HDR10, HDR10+ (which expands upon HDR10), and Dolby Vision (arguably the best, but basically equivalent to HDR10+). Not every TV supports every standard. Ditto with your A/V receiver, and your Blu-ray player, and even your UHD Blu-ray discs!!! You might have a disc with only Dolby Vision, but a TV that only supports HDR+. The answer would be to get a TV that supports every format, but good luck with that... You'll probably have to make a choice, especially at that price point. From monitoring the disc market, it seems like there might be more HDR10 and HDR10+ discs than Dolby Vision (but I could be wrong about that that), and that might be your biggest consideration. Also, there's one more type of HDR, that's HLG (Hybrid Log Gamma) used in broadcast/cable/satellite feeds. But typically most TV's that support HDR10, HDR10+, or Dolby Vision also support HLG.
I just a quick search, and it looks like you can only get TV's that either have HDR10+ or Dolby Vision, but not both...
Another consideration with HDR is that cheaper TV's might support it, but can't actually display it. To properly display HDR, you need a TV that can get really bright (nits), while still being able to reach very dark blacks (Contrast). So really Contrast goes hand-in-hand with HDR, but perhaps is even more important as good Contrast can improve all images, even non-HDR. Contrast is greatly affected by the backlight type. Edge-lit is the worst, where full-array with local-dimming is around the best (self-illuminating no-backlight is technically better, but these are OLED's that don't have good HDR brightness). With all local dimming, the more zones the better, as each zone get's smaller and is less likely to be noticed as big blocks of varying brightness (most obvious on the end-credits with white text scrolling on a black background). For the brightness, sometimes you'll see this advertised at HDR600 or HDR1000, for 600 or 1000 nits. If you can, I'd say aim for close to 1000 nits to really make HDR pop.
OLEDs have the best black levels and gorgeous colors, but can't actually get very bright, plus they are susceptible to burn-in. And since OLEDs are really expensive, any that you find at the $1800 price point are going to be entry-level and are probably not worth considering. So that means you're probably looking for a good LED-LCD type TV.
Color Gamut is how much of the possible colors a TV can actually display. This is affected by two things: the quality of the panel itself, and the bit-depth of the image processor. The Color Gamut you care about for UHD Blu-ray is DCI-P3 for HDR10/HDR10+, and Rec.2020 for Dolby Vision. A TV that can output 97% of DCI-P3 is better than a TV than can only output 89% of DCI-P3 - ditto for Rec.2020. Similarly, a 12-bit TV (68.7 billion colors) is better than 10-bit (1.07 billion colors) is better than 8-bit (16.7 million colors). If you're watching a HDR10+ UHD disc on an 8-bit TV, those billion colors are mapped down to 16.7 million colors, so you lose a lot of that original color detail, and even more so for 12-bit.
But 12-bit is still pretty expensive and I doubt you'll find one for $1800, which means you probably won't be able to get proper Rec.2020/Dolby Vision/12-bit for your budget, so you might be better off looking for a strong DCI-P3/HDR10+/10-bit TV.
Here's more on that topic, with some pictures to help illustrate some of the concepts:
https://theappliancesreviews.com/what-i ... th-in-tvs/
Other considerations: It's probably wise to get a TV that has at least 1 HDMI 2.1 port.
Teddyboy wrote: ↑Fri Feb 19, 2021 12:17 pm
What would be a good 4k tv to buy.
Obviously I avoided answering that one particular question. I really don't know, as my main TV is over 6 years old, non-4K, non-HDR, and 8-bit. Maybe other users have some first hand experience they can share.
My primary contribution was to just give some tips on what to look for. I think you can plug some of these into a good TV search engine (Crutchfield's is pretty nice) and find some good options.
Hopefully you remember to come back here and post about whatever you end up getting!!!