I disagree with you on D class being more efficient.
IF you run your system at FULL LOAD all the time and with Test tones..then yes...Go for D class.... But most of the time you are running 1/3-1/2 load on your amplifiers.... Mister D class will have a lot less efficiency at 1/3 than at full load. Now if you look at a hybrid...for instance...Arc Audio amplifiers.. Uses a/b class amplifier with D class Power supply (g/h class)...you get MUCH better efficiency than a classic a/b
I am tired of people jumping on the D class bandwagon...It is great for Subs!... But I disagree with its AMAZINGNESS for full range...
Check this out: This is a review for a Arc Audio Ks300.4
Notice the 1/3 efficiency is at 50-57% and Full load efficiency is 66%-81%
Now check out this: Its a review for a Rockford T1000-4ad. One of the better D class amplifiers
Notice the low end efficiency is at 34% and Full load efficiency is78%-83%> they didn't put the 1/3 efficiency on there because its probably lower or the same as the Arc Audio stuff.
Both reviews were done by Cogent Labs...a very reputable source!
I bet you David Analog will chime in..and I bet he will be on the same wavelength.
Don't be so quick to knock the hybrids that are tried tested and true... Guys like Shawndoggy, Midnightv10 and I run the Arc Audio amps and have had really good luck with them.
Good luck with the hunt, don't be so convinced about amazing d class...listen to them yourself first!