You can still pick up an old IBM model M keyboard in great shape on ebay. There's one on my desk at work, wouldn't trade it for any other keyboard in the world. Can use a PS/2 to USB adapter to plug it into your modern machine. Highly recommend.
Would advise against getting the Unicomp reproduction model M.. Even though they're still using the original tooling to manufacture the keyboards, the tooling is very old and worn out and it obviously shows in the quality of the keyboards they produce.
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