Honestly,
A good preamp is a good preamp regardless of whether there is sand or valves in it. That being said, see if you can borrow one from a friend or a local dealer and try it. You could also buy something cheap and used from Transcendent or Bottlehead and turn around and sell it if you don't like it.
I have both tube and solid state preamps at home and am of two minds when it comes to this issue: (sonics vs practicality)
I ultimately prefer the sound of tubes as even the best of solid state circuits don't sound quite as lifelike or three dimensional as the best tube circuits I have experienced.
I like the lower maintenance and noise that come from solid state.
Regards,
Chris