Definitely consider something like the Leak Stereo 20. World class sound from an amp that will at worst hold its value and if the past ten years are anything to go by, probably increase.

https://www.hifishark.com/search?q=Leak+Stereo+20

The important part here being that it sounds great.

Seek out one that has been restored (new resistors and caps) if possible, although there are plenty of rebuild providers around who will do it for for, should you come across a really cheap Stereo 20 basket case. Classique Sounds in the UK Do a great job.

Steve