There is a an Accuphase P-300 on flea-bay right now that looks very nice for 400.00 opening bid. No one has bid on it (it has old style analog meters, so the "light show" isn't impressive)
I know of no NAD amp priced in that range that could ever come near it in terms of build quality and musical "live with it in the house and be happy making music" factor.
If you like smooth, this amp and a good CD would make life grand.
Of course, it is over budget. ;>)
(I think I want that Accuphase. I wish I had not just spent all my $ on cart and cabling.)