kjl1065
I went through the same process in January/February before buying my new preamp. Over two weeks I listened to a bunch of preamps from some of the above recommended companies, either on friends systems and even traveling several hundred miles in some cases to dealers. I tried to keep things as fair as possible, but some variables were there: different speakers, different amps.....but some cases were like for like. I must also mention that I am convinced that a preamp should be tube based.
My thoughts that I posted back in February are here
For a synopsis, I eliminated the Rogue RP-7/RP-9, Backert Labs standard Rhumba, ARC 5SE, Atma-Sphere MP3, and a couple of others; because their sound (while excellent) were just not up to some others. I eliminated the Don Sachs/Lynn Olson Raven preamp because it was not in production yet when I purchased my preamp.
The best of the lot were the BAT VK-80 preamp fully balanced, Backert Labs Rhumba Extreme 1.4 (much closer to the flagship Rhythm than the base Rhumba and fully balanced), and Aric Audio Motherlode (non the balanced XL version). I ended up purchasing an Aric Audio Motherlode XL (fully balanced) preamp; and I could not be happier with my decision....it is the best preamp I have ever heard; period and exclamation point.
I will say that if I had not heard my Motherlode XL, I would have been THRILLED with either the BAT VK80 or Backert Labs Rhumba Extreme 1.4. They are amazing.
Here are my recommendations with 4 months of experience later (or rather if I had to do it again), and having listened to a couple more preamps. Before buying I would HIGHLY recommend reaching out to the designers to have a conversation: Aric Audio Motherlode XL (Aric Kimball), BAT VK-80 (Victor Khomenko), Backert Labs Rhumba Extreme (Bob Backert), Don Sachs/Lynn Olson Raven (Either Don or Lynn), Supratek various balanced preamps (Mick Maloney). I have spoken with all of them, and give freely of their time.
Great luck on your decision