$850 for the Classe
As a point of interest, according to some older literature I have the DR-9 originally sold in 1988 for $3450. According to the U.S. Dept. of Labor's online CPI inflation calculator, that equates to $6951 in today's dollars.
I have not heard the DR-9, but I have some familiarity with Dave Reich's designs and their reputation. Notwithstanding the very considerable respect I have for Bill/Grannyring's opinions and experience (and certainly as well for Frogman's), if I were in need of a power amp and didn't want to spend thousands I would pay $850 for a top condition DR-9 in a heartbeat.
Good luck!
-- Al