Yea I would try and find the best machine you can, but... machines this old have seen a lot of different uses, not that you would ever likely know what all they have done in the service life anyway (running exclusively on concrete is what I am referring to). I think the last 1845C rolled off the factory in 2002. These things in exceptional shape are unicorns. I posted the auction sale on here of a "barn find" 1845C with like 500 hours that went for over 40K. If you wait for the "perfect machine" with a service history, low hours for the year, you may never find it, and if you do, you will likely pay dearly for it. These things will run for a very long time, and if you have to work on it, you can be assured that someone, somewhere on here will have seen it and done it. Especially being a service tech, find one that is in decent shape mechanically and put it to work. If you need to put some effort into it to make it exactly what you want may payoff better than waiting for the "unicorn" to show itself. These are my thoughts, your mileage may differ.