Looking for an incredibly dynamic preamplifier

Dave Davenport's design would fit your bill; if you are willing to get your hands dirty and build one. It's a differential parallel feed design (the bias current and the audio signal share only one devise, a 6N1P triode). It's tranfomer coupled on both the input and the output using the excellent Lundahl amorphous core trannies. The input transformer does the phase splitting chores for the differential gain stage. I don't know if you are aware of the fact that most op amps used for the input chores on balanced amps and preamps have a rather low CMRR (common mode rejection ratio). Transformers have a high CMRRs; plus they provide absolute galvanic isolation between your sources and your amps (ground loops are NOT an issue). I have this preamp design in my system. It is dead quiet, very dynamic and very musical. It's also driving two tube amps (input Z 100k and 500k) and one SS subwoofer amp (input Z 50k) with no problems. This preamp was written up in AudioXpress if you have access to past issues.