I've been using a Tortuga passive for the past few years and love it - it's the best preamp I've heard - but would like to try something else, preferably with tubes.
I've been thinking about a Don Sachs or a LTA Microzotl, PrimaLuna or. Each have devotees who claim they compete with any preamp at any price. Still, they cost three to five times as much as Schitt Freya+.... but are they really going to sound any better? Based on reviews of the Freya+, I'm not sure.