Since you have Klispch, I would go with the NAD as it's a little smoother. Arcam are the most detailed amps I've heard and I don't think Klipsch would sound good with them. I own Klispch, Aerial, NAD, and Marantz. For your purposes, I think the NAD would sound the best. You really have to smooth the Klispch's.
regards, David
regards, David