The Goldberg Variations is one of my favorite piano pieces. For those that want something beside the obvious Glenn Gould, which is excellent, I would recomend

Rosalyn Tureck on VAI
Christophe Rousset on Oiseau-Lyre
Andras Schiff on Penguin

Uri Caine just released his third Mahler inspired recording for anyone interested.

I am not a fan of any of Keith Jarrett's classical works. His jazz playing on the other hand is excellent.