Vibe, have a look at seller "rawko" on eBay. he sells used Cherry POS boards for cheap. The G80-8200 aka MX8000 are NKRO over PS/2, have programmable and relegendable keys, and are dirt cheap when bought used (as in around $30-35 shipped.) The downside is that while they are very close to a standard ANSI layout they have an ISO enter and backslash/pipe key, and they take up a lot of desktop real estate compared to, say, a Filco (but really, not so much compared to a Model M) due to the integral mag stripe reader.
I've got one with browns and one with clears; actually I posted the browns one for sale in the classifieds if you don't want to be arsed cleaning it up yourself. (used POS boards tend to be chock full of chow and require a good scrubbing before use in civilized environs...)