I just looked at the work I intend to do *most* of the time. The most common task I do is to mow about 3 acres once a week.
Once every month (maybe a little less) I mow the other 6 acres. So if that takes a little longer than with a bigger machine, it doesnt effect me that much. I couldn't justify the additional money to be able to mow the extra space in 3 hours as compared to 4 (my estimates, could be WAY off?).
The other main task, maintaining the driveway is, hopefully, a once or twice a year event. Again, if it takes a little longer its not a big deal. I plan on hiring a dozer to shape up the road initially, so that a smaller tactor will be able to maintain it, if I keep up with it, easily.
Moving food to our animals is no problem as a 3pt platform can easily carry a couple of bales of hay and a bag of feed. I have water available close the the animals, so I wont be hauling it. Water is incredibly heavy though, so if you move alot of it, that could justify a bigger tractor, or at least a trailer.
With all that said, I still *want* a bigger tractor. However, since I dont have unlimited funds, I needed to justify every dollar. Im hoping to be able to dicker with the dealer some and come in at about 11K for the TC18 tractor and mower, which is about $400 less than his initial price. To that Ill add, as they are needed, a carry-all platform, boom pole, post hole digger and a rear blade. Long term Ill eventually add a FEL, tiller, and a box blade to that list. Any of these tractors can handle those attachments, if properly sized, with ease.
This is my first tractor, and I hope this explains some of my thought process in selecting this size of tractor for my needs. If anyone out there sees any major flaws, please speak up!
Jon