I have not had the Red Dragon mono blocks in my system but from what I have heard, they should be added to your list. They are the only digital amps that interest me. With the exception of the 25 watt 47 Labs amp, I have not owned a ss amp in 20 years, so this would be a major change for me. I will soon get, I hope, my H-Cat amp which is also ss, so there may be change in my immediate future.