Simaudio Moon i3.3 and ProAc Response D2 size is 16' x 22' x 8'
...speakers would be 18" off the wall
...listening position is 11' to the front grills
...rock/classic rock is 75% of material

Am I wasting money here? Thought about used Naim or MF here but plan to keep this for a long time so warranty is of interest...
i think you will find the Primare I 30 will be a better match with the Proac than either.
Cheers John