My M22s sound every bit as good on the 3808 as they did on the 1804. As was mentioned, no such thing as overkill(or too much wattage) as long as you are buying the 3808 for the features it has it is money well spent. The network connectivity for audio streaming was my main reason to get one, it allows for very easy firmware updates too. The GUI was a close second.

Jason
M80 v2
VP160 v3
QS8 v2
PB13 Ultra
Denon 3808
Samsung 85" Q70