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I was just wondering what makes a TV obsolete, I mean obviously the transition from CRT to flat screen rendered the former obsolete, but in terms of HDTV models which come out every few months is there really such a massive difference between them to warrant the extra expenditure?
In the LCD world you will get huge improvements in motion handling, black levels and SD performance, even if you only go a few generations back, viewing angles have also improved, as have colours. It's less the case with plasma but there are deffinitely improvements, particularly in phosphor trailing/lag on some sets, black levels and versatility in sizes. There are smaller general improvements throughout on all TVs though, deffinitely get a new model, it's worth the extra, sometimes it's not much extra either
As far as I know, they improve the panels, the processing engine (and with it the motion, colours and blacks) - I am not sure the jump from generation to generation is huge, but some of the models you mentioned initially are a few years old and thus, almost certainly less good, £500 will get you a decent 37"