I have a Burmester 218 and it is, to my ears, a superb amp. To my ears, it delivers a very natural, musical sound without being slow or soft. I checked out several good brands and landed on Burmester, but certainly no bad choices among the brands mentioned by @soix. Accuphase is warmer/softer to my ears-as @soix said, its a matter of personal taste, and that might be yours.
Burmester makes high quality, well engineered and well built products, but you should ignore anyone who tells you what you will like best or what is "better" between well regarded brands-only your ears can decide. @soix mentioned a number of great brands and some will say you can match any of them for a fraction of the cost-I don't think so-but each to their own. One thing is for sure, you will have a very well designed, well built product from a highly respected brand. Price is absolute, but value is inherently subjective, and only you can decide what represents value to you. If the sound brings you joy, don't look back.
Lots of folks have great luck buying on ebay-if I were buying used I'd want the comfort of buying from a dealer, but many have great success otherwise.
You are right, you won't see much Burmester stuff on the used market, which speaks to a satisfied customer base.
Please let us know what you think after you listen. Congrats!