I have tried several both SS and tubed and the most accurate/natural-sounding by far is the Placette Active. You can pick one up for that price used if you are a bit patient. 10audio has reviews.
They like the Dodd battery-powered tube premp in the tube preamp category. It looks like one I would like as well.
I took a look at some of your old posts and saw you considering Bryston or Krell. If I had those amps, I may want something more mellow on teh preamp. That is why folks need to know the rest of you srystem.