Let's inject a dose of bottom-line reality in this. The biggest single impact on the sound you get will be your choice of loudspeaker. Then if you go with a lower-powered tube amplifier vs. a high-watt solid state. Room acoustics also figure in there significantly, though a lot depends on your actual space.
For long-term non-fatiguing listened to classical music, there are plenty of recommendable brands of speakers: a lot of the British ones--Harbeth, Spendor, ProAc, PMC, Graham, Stirling--as well as US, like Joseph Audio, Salk, Vandersteen, Fritz (+subwoofer[s]). I wonder if there's a Vienna Acoustics dealer in your area--that would be a great starting point.