Thanks to everybody for your insights!!
One clarification: I'm not claiming that all the amps sound the same. From my understanding, amps do sound different. However different doesn't mean better. Given certain circumstances (for instance, a sufficient wattage, no distortion, flat response, etc.) many many amps sound RIGHT/CORRECT for a certain set of speakers. And furthermore we need to consider my intention of using digital EQ room correction which will probably reduce the difference between amps even more. So here's the heart of my concern:
- Does it make sense to spend 2500 USD for a sound that's slightly different (and not necessarily better) switching from a "right/correct" Cambridge CXA60 sound to another "right/correct" Rotel RA 1592 or Hegel H160 sound? I honestly think that might not be totally worth it. And hence my decisional process of getting an overkill amplifier for my current Forte III, so that this amp will be futureproof as well. Does this thinking make sense to you?
- I noticed that many of you suggested me to get a tube amplifier. I'm not sure if this would be what I need most. I don't doubt that tube amplifiers might be more ear pleasing. But… Me and my brother produce music. He's got a set of studio monitors but often we need to check our work on this Klipsch Forte III hifi system. So it'd be good for us to have a system with the lowest distortion and flattest response possible. So considering this, should I still keep tube amplifiers in my evaluation?
Ethan Wiener claims tube amplifiers have higher distortions:
"Myth: Amplifiers based on vacuum tubes sound better than solid state designs, and a good tube preamp can even restore clarity and warmth that has been lost in the digital recording process.
Fact: Both types of amplifiers can have a frequency response flat enough for audio reproduction. But modern solid state amplifiers have measurably lower distortion than any tube-based design. Most tube-based power amplifiers also require an output transformer, which increases distortion - especially at the frequency extremes. Further, solid state power amps always have a better damping factor"