I notice your current system includes a VTL 5.5. That is a preamp I used before moving to the Audio Horizons preamp. Judging by your description of the musical sound you prefer, I agree with Markwatkiss that the Audio Horizons preamp would be an excellent choice.
While delivering the round, harmonically rich sound that is characteristic of vacuum tubes, the Audio Horizons preamp is as quiet (spurious noise eliminated) as a solid state amp. Mine, for example, operates with an signal to noise ratio of > -110dB. The noise floor is vanishingly low. That allows detail and subtlety of the music to emerge.
While delivering the round, harmonically rich sound that is characteristic of vacuum tubes, the Audio Horizons preamp is as quiet (spurious noise eliminated) as a solid state amp. Mine, for example, operates with an signal to noise ratio of > -110dB. The noise floor is vanishingly low. That allows detail and subtlety of the music to emerge.