How big of a machine is that compared to a loader/backhoe?
Anything with tracks is gonna cost you somewhere. Metal to metal just wears out. There's no getting around it and if you through a track, what will you do? When it happend to me on my dozer, I had three different mechanics that said they'd come by and fix it for me. None ever showed up and I ended up learning how to do that myself.
Listen to what Dargo said about working on them in very uncomfortable places. This is what happens. They break down in the worse place possible. I had a hose break and couldn't control one of my tracks. I was in the middle of a stand of trees that I'd been clearing and it was impossible to see the ground with all the layers of branches. I had to chain saw a path under the dozer to get the fitting off that had snapped. It was a $2 part that took two days to repair!!!
For people just starting out and with minimal mechanical experience, I'd be very, very hesitant on buying any tracked machine. Even worse, I'd NEVER buy a machine that I couldn't get parts for within a day or two. That means a parts house with people you can talk to, not online or over the phone. NEVER EVER buy a machine that you can't keep running!!!!!!!!!
If the one your talking about weighs 28,000 pounds, than it's not a very big one. More of a portable trencher than a serious digging machine.
With a budget of around $17,000 and a true need for a large machine, I'd seriously recomend you look at full sized loader/backhoe's.
I paid $18,000 for my Ford 555E backhoe with 2,000 hours on it, and consider it the most useful thing I own. It will take out any tree on my land along with brush and debri. The front bucket holds just over a yard of dirt and I've been known to move 200 yards of dirt in a day with it. It weighs 14,000 pounds and when you backdrag the bucket, you can shape roads, smooth them out and cut new ones. I like it better than my dozer for finishing off a road!!!
If I was looking again, I'd probably get the same model, but put a 4 in 1 bucket as a priority. My neighbor has one with the 4 in 1 bucket, and it's twice the machine mine is with that ability. He just drives up to a log and picks it up. Simple, easy and fast!!!
Look around at new machines and see what you can afford. Stick with brands that have dealers close to your home and be patient. There's always another good deal out there, you just have to be watching for it.
Good luck,
Eddie