I haven't used keyboards with the Cherry blue or brown switches, but I have used the original IBM Model M, a Unicomp keyboard and a Dell 101. I would rate them from better to worse in that order. The Dell is quite loud but feels nowhere near as solid, reliable and stable as the other two options.
As for original Model Ms, eBay is your friend, although it can take a while to get one for a less than outrageous price.
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