David: How vintage are you looking for? In addition to the above recommendations, you could look for some early/mid 80s Arcam amps and some of the original British make Cambridge Audio "P" model amps.
I used to have a Cambridge P55 (70 watts) and now wish I had not sold it. It sold for $800 in 1985 dollars and was much higher quality than the current Chinese made budget Cambridge gear. It was small and weighed a ton.