Hi Guys! I am stuck with the decision between those 3 tv what is exactly the difference? as I read around the web PZ250T no wi-fi no thx certificate PZ550T no wi-fi but thx certificate PZ570T wi-fi and thx certificate are those the only differences? is the screen quality exactly the same? I need the tv 99% for videogames also, do I really need the wi-fi for freeview tv if I can use the ps3 for it? Thanks!