Your favorite J.S. Bach

St. Matthew Passion, Gardiner is my long standing favourite, nowadays, however, I listen more the St. Johannes Passion, Harnancourt.

Bach's solo cello suites 1-6 by Pierre Fournier

Goldberg Variations - Glenn Gould second version (first is still good)
4th partita - Willian Kappel
Cello Suits - Paolo Beschi on Winter&Winter (this is pretty much the best quality recording ive ever hear) recorded on period baroque cello with no processing in an italian villa...it sounds pretty much perfect, and the performance is excellent.

Another vote for Nathan Milstein's sonatas and partitas.

I'm also partial to the cello suites, but I prefer Starker's readings on Mercury.

I'll second the votes for Milstein's violin sonatas and partitas on DG and for Pierre Fournier's cello suites on DG.