At the price, the Arcam will be the best sounding, I have no doubt. I sold the old Arcam 100, and it was the best sounding $1200 piece at the time, hands down! It was still a receiver, and lacking ultimate power and control, but bass managment helped that. Dynamics were better on good separates as well. Yet the Arcam was pretty, musical, and rather resolved for a receiver. Only the Denon 5803 was as well balanced like that from what I remember, the B&K being close behind, maybe more powerful driving full range however.
If you have $2k for a receiver, the Arcam is good for running speakers as "small" with a sub. Most will like the sound just fine.
Denon's are great bang for the buck mostly, especially at lower price points. I can think of not much else that's better lower down. The HK's maybe for current product.
NAD...you take your chances with Quality control, sadly. Infact, my experience from selling at 6 stores say's that the China made stuff is more reliable than the NAD gear!
Still, the NAD stuff always sounded good from what I remember.
NAD used to be joked about as standing for "Not Another Deffective!" I'm not sure if it's changed any.