There is very little that the 5160 can do that the
5170 CAN'T do, but the
5160 has less crap in the way.
I seem to remember that the 5161 expansion cabinet would only work on the
5150 and 5160 machines. So if you need a lit of slots (perhaps of
lab-tope I/O cards) you might not be able to sue a 5170
-tony