I have DirecTV and haven't had any problems with their HD channels and audio. I do have one local channel that starts to skip in audio. I'm not sure if it has anything to do with the receiver as it's only that one local FOX channel. It's an easy temporary fix, I just have to change the channel and then change it back.
Amazon is currently selling the RC260
for less than 300 right now. That's a bargain.