The old original IBM "clicky" keyboards. I type this from one made in 1988. They don't make them like they used to! I consider all of the modern "spongy feel" keyboards a joke. There aren't many that I like at all.
Intel 440BX chipset. Jack of all trades, solid solid solid platform. A real performer for its day and probably the most reliable chipset I've ever worked with. My server continues to run on one today.
Teac floppy drives. Mine's 10 years old, still works like a champ.
Western Digital hard drives. I've seen many run beyond the days of obsolete. I have two 540MBs, a 420MB and various smaller ones that are between 8 and 12 years old, still work perfectly and have zero bad sectors.
Samsung drives seem to be just as robust - hardly ever see them fail.
Fans: NMB and Nidec ball bearing ones seem to run forever. The NMBs are some of the quietest fans made.
and non-PC computers, my old Atari 800 and its associated drives continue to chug right on into their 20s. Great old games on that thing...