I have had an Onkyo 838 receiver, which does decode AC-3. I am in the midst of upgrading to HD. I now have the Directv HR10-250 HD DVR, an Onkyo DV-CP701 DVD player that is capable of progressive scan (I planned this way when I needed to get a new DVD machine), am going to have a 50" Sony SXBR HDTV and am running Infinity speakers with a powered subwoofer.
I don't really think that I need or can justify new speakers. I am however wondering if there is any compelling reason to upgrade the receiver? My gut says the answer is no, but I figure a lot of you have more knowledge then I do so that I will ask the question.