Sorry to bring this thread up again, but now I know what I'm looking for:
USB not PS/2
Cherry MX Browns
No double zero key, but a full width zero key. This way if I buy a keyset for a full keyboard, I can use this set both on my keypad and my tkl Leopold.
Unfortunately, this makes the Filco and many others not an option.
The reason I want USB is because PS/2 requires a restart, and I may be bringing this to work. They won't appreciate me restarting their computer all the time just so I can use my keypad.