I know that you ordered the A3. I would say that if you can get a pair of the S1MKII for less than the A3 go with them if it is not to late. I got mine for the same price as the A3 but they are in the Mcoat finish a $4k premium. Like I said if you add a pair of subs I think that they are a much better speaker than the A3. The S1MKII is a much more refined sound signature. Yes they do require good power. I am using them with a Hegel H360 and they sound incredible.
I would look into a new amp you will want more power than what the naim has on tap imo.
I would look into a new amp you will want more power than what the naim has on tap imo.