There weren't very many of them made, but if you can find a 4555 it is way more tractor than a 4455.  It only has 1000 pto if that is an issue.  I had one and thought it was the nicest MFWD row crop tractor I ever drove.  Nice ride, nice turning radius, and the 15 speed powershift was a nice transmission.  The 4955 was way more popular, but the 4555 was a good solid machine.