Best Mid Fi Amp from 90s to today. Look

Ive heard the BK, Spectron and the Sa220. I prefered the sa220 by a landslide, however I would have reservations buying one used, as the ouput devices are no longer available and from what I understand if they go out its game over for that amp unless you want to spend quite a few $$ with the M Elliot upgrade.

(please pardon the run on sentence)

oh and I have listened to the Classe 15. Still liked the SA220.