I am sorry to ask this question but I have looked at the owners thread and really can't find the answer. It may be there but it is so long I don't have time to spend hours looking. If you want to answer, great, if not fine also. What is better about the 320 compared to the 220? Thanks.
I don't have time either. But the differences are shown in THIS chart which is one of the first google hits. I honestly don't understand why anyone buys panasonic these days given their abysmal DLNA support and small number of streaming apps.
Did you look at the owner's thread? There is a comparison in the first post by Lujan of the 220/320/500. I answered this same question a couple days ago maybe in the Help Me Choose Thread or the owner's thread. Just search my user name.