I have not heard the M6 but have owned the A3.2, A308, KW500, and NuVista 800. I really liked all of them. The KW500 was fantastic (still have it for when I put my second system in place). The NuVista 800 is truly world class in my opinion. However, I have not heard a Parasound amp for several years now--I did like it though I can't recall which model. I agree with 2psyop. Listen for yourself. When I started out, I spent countless hours listening to LOTS of gear at several excellent local HiFi shops. I identified a sound that appealed to me and have built on that sound, following the mantra of "same but better," as I have changed gear. It has served me well. I love my system. If you have questions about MuFi, contact Randy Bingham (in charge of US sales). He is very helpful, knowledgeable, and a nice guy.
