I think you made a wise decision on the 3616. I have a 2816 and I run a 5ft bush hog. At times in tall grass I wish I had a little more power, but it still gets the job done. I have never been disappointed in my Mahindra and I think you will be happy.
One plus is that Mahindra met me half way on a repair after my warranty went out. The repair was completed last week and be that as it may my power-train warranty ran out in May. I am pretty happy that Mahindra decided to help. Makes me think better of their company. Just food for thought. Enjoy your new tractor!