I have a CV500 and it's almost similar to an AV500, and I could say that the color definition of Toshiba is one of the best around. Rich without being too bright, if you get to buy one you're eyes will thank you for it. Btw, Sights and Sound is a very good place to look/buy these models. They have, in my opinion the best after sales service available. PM forumer e-reply, he can give you the best deals for Toshiba.
Thanks!
Also, I bought 2 units of Toshiba from Sights and Sound.