I tried and tried to think and I believe the best buy I ever did was a...
MX2000 for 31 euros. Yes it's old, yes it needed repairs (half an hour resoldering and adjusting), but the picture is just unbelievably beautiful. Even better than the MX4002 I also have at the summer cottage - the latter has that stupid RGB switching common to all B&O sets of that design which destroys the sharpness (I watch all my TVs in RGB since we have no analogue transmissions left).
The worst? Maybe the pair of U70s I got. I just wanted to see/hear them, and they were a lot more bashed up than I expected. I guess the sound is OK - but I can't even stand using any headphones! 😂
Sorry, but I never bought anything new 😁 The pair of BL8000s I got in a surprise lot get the closest, but the girlfriend has them now 😕