Regardless of room size, speakers etc - buy used Musician III (about $3k) - send it to Spectron for factory upgrade to Mk2 - $1.5k and for $4.5k total you have one of the best amps in the world.
Problem is that used Musician III is soild within 24 hours.
New Musican III Mk2 retails for $7k - so find a good dealer and press on price and you will get a new for slightly above $6k.
I don't have to describe the amp - do search on Interent or go to Spectron Audio web site for professional reviews. No amp with retail cost below $15k can come even close to this one - midrange of the best tubes amps combine with the iron clad control of the bass
All The Best
Rafael