Call Adelphia...I think their units can send the DD5.1 signal...you just have to ask for the right STB.

I know in my area Adelphia is offering a DVR and also has the online DVR functions. My friend is Los Feliz also got a flyer with those features as well.

With what seems to be coming down the pipe with cable companies, I am not sure I would buy a TiVo to use with cable. I would have to check the features and functionality first.