My upgrades were also extensive over the last half year, bleeding into this year.
1. Replaced Cary tube preamp with Linear Tube Audio MZ2. I already had the LTA ZOTL40 amp and the two LTA units together really is the way to go if the amp clicks with your speakers.
2. After selling the Cary, I needed a new phono preamp. Contracted Don Sachs to build me his PH16 phono stage. Couldn't be happier, again a major upgrade in sound, maybe two.
3. Upgraded a number of cables to Cerious Technologies. Just recently upgraded just the speaker cables to the new Graphene Matrix line. Wow, these were a big price jump but no regrets. Worth every penny.
4. Gave my Lyra Delos cartridge a new bother, adding the Audio Technica ART 9 cartridge to the cart stable. The ART 9 at half the Delos cost is eye opening. I've put the Delos to the side for now.
5. Six Vicousic DC2 diffusor panels between the speakers on the listening wall. It was bare before. Much better focus/imaging and they look really cool.
6. Latest purchase, the Technics SL-1200G turntable. This was another maybe two step upgrade over my prior Marantz table.