Don, I believe the 2410 is rated for a 4' cutter. Not to say you couldnt successfully use a light duty 5' cutter on grass or light brush. The 2710 is also technically rated for a 4' cutter, but lot's of people here use 5' cutters on them. So, a 2710 would be better suited for a 5' cutter, and you could probably even handle a medium duty cutter for heavy brush.
Pardon me if I look at your situation from another angle. Why are you trading the 7500? If its because you think you need a larger tractor, you're not adding very much with a 2410--a little more power and position control. I would suggest that if you are going to work any significant portion of your 40 acres, and if you have heavy brush, you maybe should be thinking at least a 3010.