The 40.2 were just at the New York show with way, more expensive gear and they sounded surprisingly good.
I would look at a Naim stack, or a Krell integrated, the Coda CS iB is a stunning integrated amplifer, and the Coda separates are just fantastic.
Then add a good external streamer and dac or a good streamer and you will have a fantastic system.
A real cool integrated amplifier is the Unison Unico 150 a tube/hybrid integrated for $6,500.00 the preamp uses fantastic Russiona 6H30 tubes with a powerful solid state ouput stage. Just stunning.
If you need any guidance we sell a lot of of fantastic lines of electronics that will sound great on the Harbeths.
It will really come down to a number of factors
Do you want an intergrated amp with a dac/streamer a two piece setup or a dac/preamp amp combo like the Nad which is also two pieces?
What will your sources be analog, digital? TV connection, other?
Do you have a price range that you want to explore good setups would run from $4-6k up to $20k and beyond with the Harbeths.
Would a hybrid tube preamp plus solid state amp be possible? Tubes in a preamp tend to be less expensive and last longer.
Dave and Troy
Audio Doctor NJ