Should I buy new TV?

Should I consider buying new TV and why?

Sony Bravia KDL-42W650 Full HD LED TV review

Well, I am not sure if I really need new TV but I am definitely considering one of the many options for big screen TV that are currently offered in most tech stores.
Right now am still using my well performing 32 inch Sony KDL-32EX650 which is just a great piece of technology, very nice TV.
Of course my biggest concern is the screen size. Nowadays everybody is looking for bigger and bigger screens but that is not always a plus, this should be aligned with things like room size, 'audience' and many many others.

Hisense H50B7300UK TV

A am not confident if I am buying new TV any time soon but I would be very happy to hear some other opinions in regards to such purchase.