I really don't understand why its down to these two preamps, but if
BAT
Atma-Sphere
Aesthtix
Allnic
might be some good places to look. I am partial of course to the Atma-Sphere stuff (I think the direct coupled output allow it to play deep bass without the flab you mentioned).
If you really really have to go solid state, I would look at Ayre and Pass Labs.
As a further recommendation, if you're going balanced get a preamp which supports the balanced line standard (AES file 48 if you care to google) which will reduce the effect of interconnect cables on the sound in your system (read more detailed, more natural).
Transparency - Delicate - Linear - High resolution - microscope but not sterile not etched or lifeless - I know there is a fine Line here but I'm looking to walk the line as close as I can - real see through into the music - transparent to the source because I love my DAC - extended and to remove as many layers without being clinical - image and sound stage lover - tight bass - hate flab - like speed and transparency but needs to be musical.and you have an amp with a balanced input, then for starters I would not look for a solid state preamp, and balanced operation will be helpful. There are a number of manufacturers that make such things. I would stay away from ARC because they are at their limits working with the Pass Labs amps. So
BAT
Atma-Sphere
Aesthtix
Allnic
might be some good places to look. I am partial of course to the Atma-Sphere stuff (I think the direct coupled output allow it to play deep bass without the flab you mentioned).
If you really really have to go solid state, I would look at Ayre and Pass Labs.
As a further recommendation, if you're going balanced get a preamp which supports the balanced line standard (AES file 48 if you care to google) which will reduce the effect of interconnect cables on the sound in your system (read more detailed, more natural).