Great topic and great advice. I have a very similar situation with about 20 acres of mature woods that "skipped a generation or two", as there are mature hardwoods, over 16 inches in diameter, then a bunch of thick underbrush about three inches in diameter. I want to clear out a lot of the underbrush and have some nice grassy areas and pasture under some big hardwoods. I then want to push some trails through the rest of it. I have thought about renting a dozer to push it into piles. Then burn, but the problem comes when the piles need pushed up again, as the rental unit is gone. I hired someone to push up some piles, but the continuous pushing up as they burn themselves out makes the need for something other than rental.
A guy down the road has a Liebherr Loader he might sell, so I am leaning that way, or a really big skid steer, like an ASV 4500, that is about 80 HP. As others have mentioned, mess up the hydraulics, or transmission, and you soon have a pile of rust in the back yard. What I don't want to do is drop 15 grand on something, have it "blow up" and then have it rust right there, as it isn't worth fixing.
Any thoughts on Liebherr Loaders? it is a 621B, so a pretty big machine, but great for grubbing and pushing. I could also dig that pond.
Would I be better with a big skid steer, a dozer, or a loader?