I had the M3. If you like your sound laid back and warm and likely a similar signature from the M5 (have not heard it), then go with NAD. The build quality is very good and the M3 is a beautiful piece.
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First off, if you get the M5, get some SACD's, you will like them. !!! Still plenty available new and used,
In any case, I own an M5 and love it. Besides sounds great, great build quality, 5 year warranty also. It also does HDCD, and about the only SACD capable player to do so.
As I told somebody else recently, go to Audio Asylum, and search the SACD forum for NAD M5, and you will find several discussions.
PS:I also thought about the M3, but I still get hung up with the more traditional MAC preamp, then the more modern look of the M3. Weird I guess !!