Anyone experienced the Luxman MQ-300 or/and The Air Tight ATM-300R?

I think the MSRP now is 20K.

It is. Which means you can buy a brand new one for 14-16k If you have a good relationship with a Lux dealer.....or you can buy the 5-6 Year old one for the same price. (And it might be older than that as he lost the line YEARS ago)

MSRP is higher than $20k and used to be closer to $30k. 

And you can’t buy new Lux at 30 off no matter what price. Good luck trying though. 

Hi Keith,
I just saw your system. Do you  still have the Bardo?
Also the max rebate for Luxman is around 15%..

Best to audition both amps before purchase. 8 watts/ch is only going to go so far...and that is assuming that your speaker even has a mild impedance character across the board! 
Friend of mine has so called 'efficient' speakers--rated at 95db...yet these same monsters drop down to a 1 ohm load in the bass. So, he was surprised that the system sounded thin and a little veiled...
Just like JVS of Stereophile fame who was surprised at the results he ineptly got when he matched the Jadis JA200Mk2 amps up with his original Wilson Alexia's...duh!