Your best bet is to buy a small low hour used combine of the size/capacity you require. Many are around that can be purchased for a fraction of the cost of a new one. The older cabs are not as nice and quiet as the new ones but these machines but they will easily get the job done. Lights are better on the new combines too, if you work at night a lot think about upgrades here.
You kind of have to be handy with your hands and tools as you can put more money in repairs if a Dealer does the work than than the combine is worth.
My experience anyway.