I have Don Sachs' SP-14 (currently back for the latest upgrades). It is absolutely killer! Musicians in the room, goose bumps, the whole nine yards. It hits way out of its price point. I've had quite a few expensive and highly rated preamps over the years, and the SP-14 is up there with the best of them (for a lot less money).
As Charles says, the Linear Tube Audio Micro ZOTL is supposed to be amazing as well, however I have not heard it.
As Charles says, the Linear Tube Audio Micro ZOTL is supposed to be amazing as well, however I have not heard it.