Focus guys.
Fact: The Original Poster needed info for a tractor on 12.5 acres to do other things besides mowing, like FEL, PHD, Backhoe, etc... So with your statement above are you suggesting them to get a big Gear Tractor with a 15' Batwing or 10' Mower? How's that going to help with the other tasks?
Ever heard of "It's not what you know. It's how you use, what you know." Or, "Right tool for the job."
Seems like if someone asked you advice for tools/hammer to built a small dog house, you'd say "Get a Sludge Hammer. I can out Hammer any other kind of hammer with it."