Hi Rafael,
I am aware of the H2O you mentioned. Here is the H20 I am talking about: http://www.hegel.com/h20.htm
H20 VS H2O :-)
What I intend to find out is - Is the Hegel H20 worth the premium over Parasound A21 at more than two times the cost of the Parasound? I know that I cannot go wrong with the A21. I have not come across one user experience that dismisses these amps as "bad". Most people consider them as "not as good as the ultimate", which is a very good thing for the price they command.
Class D is something I considered before (W4S, NuForce, CIA, etc). But looks like they might not go as well with a TVC, as a regular class AB amp would go.