No specific model suggestion; but if you can work with a 2WD, gear, machine, and Ag or Turf tires, those machines will be less desirable, and cheaper, as a back up machine. Since you have a small-low HP machine, I would be more inclined towards a 2nd machine, with more HP, and Ag tires. I like my CK2610, but I'd I was to buy a 2nd machine, I would look at 40-60hp machines, with less modern convenience, to gain some more coverage. I wouldn't want a 2nd CUT, similar spec, on same property, as I can only operate one at a time. Basically, I would want to add a capability that I don't already have, if that makes sense.