I have a 32 inch, Certainly wouldn't go any bigger. If you have the money do what im going to hang a televisiong on your wall for movies ect and then have a monitor on your desk.
Recomended televisions- Sony Bravia, Panasonsic Viera, LG and probs Samsung
Montitors- Probs a BenQ would be best value for money.
Just use the search feature on the side, been heaps of threads made