@OP. I am also looking for a new preamp. My power amp is a BHK250. I have a PS Audio BHK preamp and I just finished home auditioning an LTA microZOTL preamp. I prefer the microZOTL - it has a more delicate, but full smooth, sound. I can hear more detail at a lower volume; voices are more natural; and instruments sound more realistic. The microZOTL is a great preamp and I may buy it.
Today, I received a recently purchased Luxman CL-38uC preamp. It is a beautiful piece of gear. I plan to spend the next couple of days auditioning it and then decided between the microZOTL and CL-38uC, and sell the BHK preamp.
LTA has a very good 14-day home audition program, and you can get a fully loaded new one for just north of $5K. It may be worth your while to look into it.