Recommendation for ATC SCM150 Amp/Pre

I ordered SCM150 passive speakers and awaiting shipment in about 2 months. 

Looking for an amp/pre amp combination that would best work with these speakers. 

I have a large pretty well treated room, 45' x 16' x 8' 

My taste is classical large scale symphony, piano, cello etc. 

Dynamics  are very important but so is tone and instrument timbre. 

I love harmonically rich tube sound but understand that I will be limited by power. 

Front end: Technics 1200G with umami red cart, luxman eq500 phono, Aurender A100 streamer/dac. 

I am open to Bi-amping options if anyone can recommend from personal experience. 

budget 20k for amps, 10k preamp, used market ok. 

possibilities : Electrocompaniet  AW 300M, single AW800,  Audio research Ref 250 or possibly 750, luxman m10x, etc.