Try
www.ebuyer.com the samsung and lg tv's are good quality and affordable.
Despite what the other users have said, I would strongly advise investing in 1080p.
Correct, tv is currently broadcast at 1080i but sure enough it will come to 1080p and its best to have it already rather than upgrade later. There is a real difference in games consoles and blu ray dvds when using 1080p too so I would suggest go for it!
nickynackynoo is right to suggest john lewis, don't forget to use quidco ect wherever you can!