I am considering purchasing the following dvd players: Yamaha DV-C6760($199), DV-C6770($269). Besides the ability to play DVD audio, what benefits does the 6770 have? Is it worth the extra $$ to have the ability to play DVD audio? Anything comparable from other brands? Any advice is welcome.

If you value good sound, and have a system to match, the DVD-A is worth it. If not, it's not. Don't know anything about those particular models, though.