if you had the cash, i would say get a 3pt hitch backhoe with subframe for your tractor. backhoes just come in handy in multi things.
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as far as renting a excavator / track hoe. that could work to. the major down fall to this is relying on someone to haul the unit in, and unload it. a 1/2 day could be wasted. just waiting for them to show up.
if ya rent, make sure you call up to a couple hours of away from "equipment rental companies, or machinery rental places" it might seem like a long 2 hour drive. but cost wise, it could mean 200 bucks or cheaper on different things. (rent costs can vary widely).
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you do have other options.
for example, cut the tree top off, and then leave say 6 plus feet or what ever is easier for you to do. (higher the better). of stump above ground. and then push / pull using FEL or draw bar on 3pt hitch. to pull stump over.
there is also a good old steel rim, from a truck. or A frame. method. and using a chain / cable. to pull trees.
you might try an advance search for my nickname and "frame" on this forum. and should bring back a 3 or 4 threads that give better detail of above.
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other options, is contact local logging companies, or put an ad for example on craigslist.com or local paper. for someone to come in and cut down trees that you want. pending on company, they may bring in a rough cut board machine, they take what they want, and you get what ever is left. perhaps cut to rough sizes (length / width) and no cost to you when it is all said and done. (depends on what you want done overall though)
pending on agreement, they may deal with fixing all ruts, and stumps when done cutting trees down, etc... or you deal with stuff (could be problematic, on amount of ruts / size of ruts)
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dozer can work to.