I know that BIG's family already purchased something, yet just to add the homeowners perspective for future searches.
Bought a Case 1845C for work around the house and light excavation for a little extra money. Maintenance is huge on this stuff! I will second what was said above in regards to a hammer. I rented one once for a job and literally in less than an hour of using it, all my freshly greased joints had all the grease pushed out, (not too mention that it was a long day sitting in that seat)! Never took another job where I had to use a hammer again.
Not only is are the drives, chains and motor work expensive, but it is the small stuff that will get your eyebrows up. For example, I bought new pins/bushings for my arms and walked out of the local Case place a couple hundred dollars lighter in the wallet. Also hoses were one that surprised me. You blow one and you are looking at $20-100 bucks depending on what it was for? And there are a fair amount of hoses on machines than you might think.
The big stuff is important, yet the small stuff is where it will frustrate you to no end. Once again, maintenance, maintenance, maintenance!
So with all that said, if I were buying again, I would make the sale contingent on and afternoons worth of working, (screw the auction machines). In addition, I would climb over the thing top to bottom paying attention to the small details that were attended too by the previous owner.