Speaking of Model M's . . .
I just recently ordered a EnduraPro from Unicomp.
It includes a numpad...but the saving grace is the fact that it has a built-in trackpoint. So, the reason I hate the numpad is nullified (reaching over it to get to my pointing device).
It has been sent home (for some reason, Unicomp is not allowed to export the USB-version overseas)...so it will be a little while before I get hands on it.