I ha to bite the bullet two years go when I stumped up £3,000 for my 55" Bravia 3D LED, but don't think I would ever pay more than maybe £4,000 for a TV, no matter how great it may be.
I'm really liking Sony's new 4K flagship X9 series though:
http://www.sony.co.uk/product/tv-139-55-lcd/kd-55x9005a
The 55" option comes in at a reasonable £3,299, although another ten inches will cost you a whopping £1,700 extra! The 84" model (which looks completely different) is a staggering £25,000, and has ridiculous speakers strapped on the sides which look like an afterthought
I still personally believe 4K is 10 years ahead of its time, like with most technology which Sony develops. Most of us have only just adopted LCD / LED screens, with some maybe recently having upgraded from a plasma screen to a 3D screen. We're not ready for another leap in technology so soon, and an expensive one at that!
Blu-Ray has been around for nearly eight years now, yet it is still struggling to take a significant market share away from Dvd's. Most films are only just being given the 3D treatment, with many titles still not even available on Blu-Ray at all! If and when 4K does start to take off, it will be a much slower process than it was with Blu-Ray - I certainly don't want to start replacing my Blu-Ray collection with 4K releases this soon, and I will definitely be cherry-picking titles!
One thing I am curious about is whether the PS4 and XboxOne are 4K forward compatible?