Try and audition a Coda No 16 stereo amplifier. Prefered to Pass for those that made the comparison. Made in Sacramento. May not fit in your rack though.
Unless you're dying to burn all that cash, here's an alternative.
"The i.V Ultra amplifier has handily outdone all other amps reviewed, regardless of genre, which is unprecedented. I invite the community to peruse the entire listing of amps I have reviewed from the past 14 years; there is not a one of them, not a single one, that I would prefer to be hearing. It’s not just a matter of being somewhat better, or in some respects having advantage, but rather a wholesale superior experience."