My favorites:
Alfred Brendel - D958, 959, 960 - 2CD, Philips (from the earlier Philips cycle)
Alfred Brendel - Impromptus - Philips (from earlier cycle)
Alfred Brendel - D575, 894, 959 and 960 - 2CD, Philips 456573 (BBC live recording)
Alfred Brendel - second complete Philips cycle (sonatas, impromptus, moments musicaux, deutsche Tänze, Wanderer Fantasie, etc.) - Philips
Imogen Cooper - complete cycle - Ottavo
Radu Lupu - D845 and 894 - Decca
Radu Lupu - Moments musicaux, D780; sonata D958 - Decca
Radu Lupu - Impromptus - Decca Legends
Murray Perahia - D958, 959 and 960 - 2CD, Columbia
Murray Perahia - Impromptus D899 and 935 - Columbia
Maria João Pires - Le voyage magnifique - Impromptus; etc - 2CD, DG