If going 2nd hand then defo check to see how long the current program/s will last. We both got a Kick in de Bollix when it turned out the old Hale MCT 05+ would be defunct in a years time.
I see the Hale microtax 06 on your list, if'n the MCT 05 is gone this year and the MCT 05+ is gone next year, then I wouldn't be holding out too much hope on the MCT 06 lasting too much longer.