For me Bach's organ music is in a class by itself--inexhaustible. I've got a shelf full of it. My current favorites are Toccatas and Fugues, Joan Lippincott plays the Flentrop organ of Duke University Chapel, Gothic (a 1997 release), and Preludes and Fugues, Joan Lippincott plays the Paul Fritts organ of Pacific Lutheran University, Tacoma, WA, Gothic (a 2002 release). Major music, superb performances on well-chosen instruments, state-of-the-art sound. The cumulative power of Lippincott's performance of the great Passacaglia in C Minor BWV 582) is spellbinding.
