I had an Ag Leader PF3000 system on my JD9610 and really liked it.  When I got my 9870 I used the 2600 display and the JD equipmed sesnors.  Finally this past fall I changed it out to the Ag Leader system.  I already had the Ag Leader display for planting so that was not part of the extra expense.  If you look at the new series combine you will see that it is made by Ag Leader.  I have been very happy with my changeover.