If you are going to play other games such as FPS games its better to avoid using televisions as the ghosting and graphics lag are worse than a normal pc monitor and will affect you playing fast paced online games such as FPS. If you just play RPG/MMO games then televisions are your best bet as there are some great deals for 32 - 42" HD televisions at the moment.

I play with 2 x Asus 24" dual screen 4tw!