Sony KDL40R450A 40" Full HD LED LCD TV: 30% OFF

What should a TV's ideal size be? I'm always buffled by this question as TVs nowadays seem to be getting bigger and bigger. Somebody should put a stop to this madness. I think ultimately, a 40" one should be OK. I mean our house, or room, can get biger and bigger but a TV should not be the only fixture there. Seriously, I'm just rehearsing my piece here because I'm planning to convince my wife to get this Sony KDL40R450A 40" Full HD LED LCD TV from sony. They have it on sale at 30% OFF the regular retail price, and I only need to pay $499 for it. It's even delivered FREE. Do you think I'll convince my wife to shell out the money? Watch out.