I use an IBM model M with a PS2-to-USB converter
:o)
I use a Unicomp Customizer. It's black/silver and has native USB.
It also uses the famous IBM/Lexmark buckling-spring mechanism.
BTW an old dream of mine is finding an IBM "M" keyboard with the
trackpoint (know as "clitoris" in Brazil...go figure! :oD). I'd love
to buy one, any info? :oD
The only difference is that you can't remove the key tops like you could
with an original Model M.