NAD vs Cambridge audio vs Music hall

I have recently purchased a music hall a25.2 and I am very pleased with it. I had a question directed to the technical department and the big man himself answered the same day. Very courteous and available. Try that with NAD or cambridge audio. The music Hall is very smooth, liquid and rich sounding without any distortion (.004%). The build quality is superb with a gorgeous real aluminum remote. I'm sure that the rated 50 WPC is very conservative which is important if you want to run totem speakers. I'm purchasing a pair of totem rainmakers for my system. I'll let you know how it all works once I get them. Nad makes good stuff. I have a NAD CD player. But they look cheap in the black plastic. The cambridge audio is cheaply built and they seem to have problems. Check out the forums on the internet. It's too bad there aren"t any english reviews on the Music Hall. I bought mine without hearing. A german magazine did a review on the a25.2 and loved it. Front cover stated "Music Hall of Fame."

I started with a pair of Dynaudio Audience 42's. I listened to both the Cambridge and NAD. I thought the NAD had the better sound with the 42's, at least to my ears. I use this set up in my bedroom. It works well.

From your 3 NAD is best but try Creek 4330 if you don't mind going used.

I own Music Hall a25.2.
It is bright sounding (at least in my system with Rotel phono stage) but very realistic. It takes time to get used to it's sound (it took for me anyway) due to the fact that I was coming from Yamaha separates that sounded muted and bassy.
Music Hall will not impress any heavy metal fan with deep bass. This amp is perfect for classical or pop. It does not have dramatic or colored sound but rather very revealing and quite natural sound indeed.
Some poorly mastered records would be almost unlistenable with Music Hall. But if you have a good CD player SACD or really good record that amplifier would sing and shine.
It is built like a tank.

NAD is going to be more rounded and laid back sounding - perhaps the most neutral of the three. Cambridge is going to be more forward and "exciting" sounding, but 640 is a more capable amp than the NAD C320 (might want to look for an NAD C352 as Internet closeout for under $500 and packing 80W as alternative). I think the Music Hall is the highest quality amp of the three, with more solid build and decent sound. Suggestion about the Creek is interesting.