Advice on equipment

I would sell the Fisher and keep the Carver. As for efficient speakers consider Tekton:

With 30 watts per channel from the Fisher and assume your other receivers produce at least 30 watts it would be over 90dB sound pressure at 3 meters with 87dB sensitive speakers. That is loud. I am not fond of Klipsch unless they are Cornwall or Khorns. If you must have high sensitive speakers buy Cornwall and never look back. No problem with the Cornwall competing with $3K and higher cost new speakers.

I would sell the Carver, keep the Fisher 800C (will be great with efficient speakers),

keep the Sony, enough power for less efficient speakers now, use in a second system later. It can drive two sets of speakers (another space?). I use my transistor Receiver in my Shop/Garage system, each space it's own speakers. A, B or A+B.

Keep look for a great deal on used efficient speakers while saving for new Klipsch if used concerns you.

Klipsch announced an upgrade for the Forte III to Forte IV,  you could maybe find a pair of III around your budget and do the mod when funds allow.  

Forte III is a very capable speaker.  

I own the Klipsch Forte III and two different models of ZU Audio speakers.

They would work well with any of your compoients.