IMO it depends if you need a new TV now. I recently bought one because my old telly packed in. With DVDs the picture quality is great but with NTL digital, the picture on some channels can be appauling due to excessive compression, they looked ok on the old CRT but on the LCD it looks awful due to the upscaling.
I could be wrong but isnt the UK thinking of broadcasting 720p and not 1080p anyway ??