I found a '07 5105 MFWD w/ FEL, 70 hrs - $23,700. This seems to be a pretty slick tractor and the seems pretty reasonable. I thought I'd run it by the experts first though.
70 hours is hardly used. That setup would have been around $27-30k new depending on the "deal" for a new sale. Without researching the current market, it sounds like a fair price.
What do you want to use it for? I own that exact tractor, so I can provide some insights if I know what you want to do and what your land situation is.