which preamp

+1 on Klyne. If you are lucky enough to find one.

You could go for a low maintenance tube preamp like one from Herron.

As others have said, none, but one of the most musical SS preamps out there, and excellent at typ used prices, is the Tom Evans Vibe with Pulse or Pulse II power supply. Make sure to get the Lithos 7 model.

What are your requirements in terms of ergonomics? McIntosh ss is oftentimes called tube-like and has plenty of bells and whistles.

Above recommendations are very good, and I'm also wondering why not a tube pre? Are you concerned with impedance matching with your amps?t

I have a Lamm LL2 I'm delighted with, which has been basically non-maintenence. Of course, ergonomically it's pretty low on the list, but that's not high on my list.

Smokenjo,
I believe that you'll find a SS preamp that will make you happy, however it won't sound like a good tube preamp. They're just different and should be.
Have to agree with Syntax. If you truly desire tube performance you need a tube preamp.
Charles,