Model M
Prosaic though it may be by comparison, I just want to put in a word for the IBM Model M keyboard (I doubt I'll be alone in that either).
This particular beast has been serving me well for longer than I care to remember, and the mechanical keys are still a typist's delight. Cherry MX keyswitches are apparently all the rage with the kids these days in their fancy new mechanical keyboards, but have you seen the prices they charge for those things?! Besides, there's not a one of them that can hold a candle to either the build quality or the charm of the original.