I've tried a number of things that have been well reviewed, or seemed to have found favor among different forum residents, across several forums. They've all had strengths and weaknesses.
Superphon Revelation II pre
McCormack DNA 0.5 Deluxe amp
Forte Model 3 amp, restored
Adcom 5400 amp, restored
Acurus L10 pre
These were all okay, but lacked any exceptional greatness or synergy with anything else I had on hand at the time. On the other hand, a Nak CA5, or a B&K Pro-10 MC, both of those were really pretty good SS preamps, and matched well with many other pieces.
Schitt equipment was mostly unlucky for me, although I did like the Asgard 2 for a good while.