I trust that you will get some additional responses to your inquiry, but let me ask a question that is slightly off the topic, yet germane. Why do you particularly want or need a preamp with balanced inputs (the bypass circuit is obvious)? There are many audiophiles (myself included) that do not think balanced inputs are clearly preferably to single-ended, EXCEPT in situations where you have very long interconnects between your source components and the preamp. I have owned and used preamps with balanced inputs, and never heard any sonic improvement over preamps with single-ended inputs -- but the interconnects never exceeded 1.5 meters (and most were 1.0 meters).
If you were willing to consider a preamp with only single-ended inputs, your choice of preamps would certainly be broader.
If you were willing to consider a preamp with only single-ended inputs, your choice of preamps would certainly be broader.