Wow that Iron Horse looks pretty nice. What's the price for one of those? At almost 1000lb, that's a serious piece of equipment.
I still keep thinking a DR Powerwagon might work well for you. Only needs a 3-4' trail, and can steer around bigger trees or rocks, so all you need to do is plot a rough path by cutting down the saplings in your way. I've been able to leave my lot relatively untouched, while still hauling out enough wood to run my stove all winter. Not the solution if you're looking to pull out 20+ cord a year, but in my case I can get at least 5 cord over a few weekends, and that's enough for me.
About the same time I got my Powerwagon, I also picked up some new chaps and a helmet. Cutting in an untouched woodlot like that there are lots of snags and stuff on the ground that makes for easy accidents, so some PPE is a good idea. I got a set of Labonville chaps that I really like, and they're made right next door in New Hampshire. Next I need a set of 2-way radios just in case, as cell phones don't work out my way. I work alone most of the time...