Some good advice in the preceding post. I would only add that Hegel H190 and Belles Aria (std version) sounded entirely different in my system (Lumin>amp>Harbeth). The H190 was the darker sounding amplifier, as were the H80 and H90 that I also owned. The Aria was the amp with more detail, depth, bass, and presence of musicians being in the room. I can only imagine the Aria Signature model to be even better sounding.
Upgrading my system
I am a bit of an anglophile when it comes to my music system. Currently have a Magnum IA170 integrated amp driving a pair of Castle Durham speakers. Sound is nice, warm but not overwhelming and detail could be better. Looking at Belles Aria Signature or Hegel H190 or Musical Fidelity M5si integrated amps.
Also looking at speaker upgrades considering Harbeth P3 ESR XD or ProAc D2R with ribbon tweeters.
Any experience with any of these components and recommendatios? Listening room is 15 x 14, carpeted hardwood floors, fairly decent acoustically.
Thanks for any thoughts.