Very cool. I am a big fan of some Chicony keyboards.
I bought several NIB KB-5181 keyboards from a wholesaler in Phoenix. The 5181s use blue SMK Monterey key switches that are a pleasure to type on - sharp tactile bump, with a light touch. These key switches were intended to be "ALPS like", but I don't think they feel similar to the original complicated ALPS keyswitches. They're sort of a cross between Cherry MX Blues and buckling springs - very clicky but not too loud.
I have a few passive AT to ps/2 adapters lying around. If you can't find one easily, I'll send you one. You may need to get a blue cube ps/2 to USB adapter to enable your 5161 to work with a modern PC. ClickyKeyboards.com has them for $15 and ripster has posted another online source where you can get them for $7.
Thanks for the info. I would be very thankfull if you would be able to send me an adapter, seeing as how I have no way to use the keyboard unless I have one. Just tell me where to send my information and I'll get that to you. Should I send it via email or via a message in the geekhack forums?