If you are serious about getting a mechy keyboard, take some time - check out keyboardauthority, or geekhack, and spend some time reading the reviews.
For those buckling spring aficionados out there, you can still buy them.
http://www.pckeyboard.com/Unicomp makes the original designs on the original equipment, although the plastic quality is not the original

. Bonus - they will do custom key layout as well (for those amiga key ppl). Bonus bonus - they don't cost 100+ dollars off ebay and they come with either a PS2 or USB cable.