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.