One of the quietest SS preamps you can find is the Holo Audio Serene. It has some similar sonic characteristics as the CH I heard this summer. I own the Serene.
Though for many setups I had, I liked the Benchmark HPA4 or LA4 preamps more. I also have the HPA4 in the Office setup. The Serene is a bit warmer, and both are at the top end of quietness (at any price).
The Serene is an easier recommendation since it has the tinge of warmth. It really goes well with all Class A amps I paired it with.