Do you still have the SFCD? Shall I put up your name in the owners list? How good was the pairing?
Actually I like the Krell 300i. My friend is using it to drive a pair of ProAc Studio 125.
Owners of the Krells that I know said the same thing. They prefer the 300i to the 400xi. I tend to prefer the 300i too. Come to think of it, I don't really quite like Krell that much actually.. hahaha... prefer the European amp.
Hmm..... let me check this out.

Outdoorxplorer,
Yes, I remembered your former system (Sonus Faber Concertino Domus with Audio Research source and amplification plus some exotic Zu powercords) well. 
There are two actions you could initiate; brood about it and do nothing OR pick up the gears you missed most and re-assemble a system around it/them.
At lot of non-owners of Sonus Faber loudspeaker thought that the solid wood panels of walnut or teak present on these loudspeakers is for aesthetic reason but the actual primary objective is to allow for resonant tuning of the cabinets as it is impossible to totally eliminate all resonances.

There are certainly many ways to skin a cat as people usually say, and not that I am a cat hater 

I am sure it is a good match although I will tend to agree with others in the sense that it is an overkill as your Audio Research VSI55 is good enough even for Sonus Faber Guarneri Memento.

Editted : PS :  of course, the audio research is totally another story. that audio research is infact pretty impressive to me, or i could even said i admire what an AR can do. if runemastertan is talking about an audio research amp to match a toy tower. i will say "go ahead, fast fast grab it. it won't make u regret".
lol