Ran into a Sony rep in a store and he said the 300- BD player is the entry level model, but might skip if you have your sub cranked up.

He said the 500 series has more anti skip and solid state technology built into it and I cant remember which one is the top of the line from Sony, maybe the 550. He said that it has all the features of the 500, but 7.1 audio is better than the 500.