2 acres is quite a bit of mowing in my humble experience. I had almost an acre in suburbia that I cut with my X500 and a 48" deck. It was flat and not many obstacles so it was a breeze for this machine. My huge trees were all on the perimeter of the lot.
Keep in mind that mowing may be only a part of your machine's duties. Snow? Leaf cleanups, dirt, mulch or firewood hauling, a garden perhaps? There are mowing machines out there that can handle all this but would be at the far end of their design capabilities. These you can read about in this and other forums with low hour machines failing too soon.
I know the JD brand from my experience, and if you are look at the Green stuff, an X5XX or X7XX seems to fill current and maybe future needs for this size lawn.
Mark LI's questions are very important. The work expected, and anticipated,. should be the basis for machine selection.
In my opinion, material and build quality, engine, and transmission should be researched before you make your choice. All should be capable of your full expectations, if they are, that is the machine to put on your "approved for purpose" list.
A good choice will pay you over and over again. Going too light, will cost you over and over again.
Good luck, it is an exciting project to undertake.