I have a trusty old Yamaha DSP E800 running along side a Cyrus series 8 Amp to give me 5.1 through a set of Ruark Vita speakers. The question is what benefit will I hear in upgrading to a more modern AV amp. Unless you can do a side by side comparison at home it is almost impossible to judge if the improvements made of the last few years make it worthwhile to replace my amp. Opinions from any one who has been on the upgrade path would be most welcome and particularly suggestions of which amp (if any) would be considered to be an improvement.