Looking for some ideas

You could look at an LSA Integrated Hybrid Amp...very nice at around $3000 or so. Also, Primaluna makes a very good Mono block/preamps I would give them a serious look. Cary makes some great tube Integrateds.

Chasing after amps may not fix them to where you want.
(((but not sure the Caldera will perform well)))
We had a pair of these traded in the guys exact words were i couldn't listen to my music anymore
The confusion is they are so good looking that you want them to stay, one of our customers who owns them, became like a deer blinded by the lights and purchased over 45,000 dollars in power cords,speaker wires cables and placebo tweaks and still continues to this day to chase his tail hoping for a better outcome.
I gave them a listen with an 8 k amp and concluded the same as did the guys below. One of these days he will figure it out.

folks at ST phile.
Especially considering the Caldera's high price, I was disappointed in its measured performance. Though with some kinds of music the speaker's shelved-up highs will be balanced by its heavy bass, the mid-treble emphasis is hard to hear through, as MF found. The overall poor integration of the drive-units suggests that more work is required to produce a neutrally balanced design.
New samples: As Michael Fremer explained, Audio Physic was
horrified when they received the preprint of the original review.

There is a VAC 160i up on Audiogon today. It's at $6000 but while I don't have one I have heard one. And it blew me away. At half price and almost new it would most likely be the piece that you were thankful you found for a long long time. If I hadn't just put the room together for a long run preamp to amp I would sell my stuff and grab it.
IMO VAC has the truest, most musical sound out there today.

Take a listen to the Cayin/VAS line of tubes, pre and main. Great sound, great value. Same company makes the Primaluna line. If you are a vinyl lover you will like the Citation I pre amp which is based on the HK classic.

thanks for the ideas. Local company suggesting Rogue Audio. Possibly Metis/perseus preamp with Atlas Amp both at the magnum level (ie larger power supply). THoughts about Rogue for my first entry into separates