I was forced to buy a new TV because the old(ish) CRT packed up (not the tube, the electronics).
I looked on the internet, but then I went to the shops to look at the TVs "in the flesh" to see what the real thing looked like. I tried to get a feel for picture quality too, but many stores didn't seem to have a proper comparative setup for this.
I settled for the Sony Bravia 37 inch, an upgrade from the failed 28 inch CRT (not even widescreen). It was "HD Ready" rather than full HD, but at the time there was very little HD content available, and the UK was in the middle of changing to a new TV transmission system.
I DID look at Samsung though, and it was close. I bought the Sony from Amazon, it was cheaper, and I had a £100 voucher as a gift from a casino
Now, there is new technology in the pipeline. Firstly, no need for an analogue tuner since this old system has all but been switched off. More HD content means it is worthwhile getting full HD. 3D is also coming out soon, so I have to bear this in mind. New OLED screens have been developed, and they DON'T have a backlight that can fail, the LEDs themselves emit the coloured pixels.
I recently saw an advert for a 4 LED pixel screen, where a Yellow LED joins the traditional RGB setup. This MAY improve the picture, but could be nothing more than a gimmick. I will want to see this set compared to a normal RGB one before I consider paying extra for this "improvement".
My PC monitor is a DELL 22" Full HD, but since Samsung seem to be so good, and can be bought more cheaply, I will consider this as an option for my next new PC.