100W+ solid-state amps known for beautiful mids


Quad 909 back in the day had a reputation for the best mids running up to $5000. I've used it in the past and I would definitely say that the mids were the highlight on that amp. It wasn't overly coloured, a hint of warmth, but it had a purity and sweetness to its mids. Unfortunately, mostly everything else was okay at best, kind of rolled off at both ends and congested stage-wise.

I'm looking for that same purity and sweetness without sacrificing the rest of the sonic traits. What have been your guys' contenders for 100W+ solid state power amps with the best mids?
128x128hedonism
Thanks for your wonderful suggestions guys, keep 'em coming! 

To maybe help me narrow my search, I'd like to add that a tube preamp is a must in my personal system, and since the majority of tube preamps are single-ended and output-capacitor coupled, I'd like to specify that ideally, the power amp should have high input impedance and have RCA inputs!

For reference, my current system consists of:
Rockna Wavelight R2R DAC
Vacuum Tube Audio SP14 6SN7 linestage
PASS labs X250.5 power Amp
ATC SCM19 v2 speakers

Shouldn't mids be the result of a high quality source and pre?  Amplifier should just increase signal without noise or color ... 
Chord Electronics SPM 1050 or 1200C (both in MkII versions) - Chord provide amplification to the Royal Opera House, Convent Garden - not heard the new "Ultra" series but, many on the second-hand market as Chord fans upgrade to "Ultra". Should work well with ATC's.