Good choice on the blade, I've got a 84" on the 3120, and it's too big, figure it will now fit the 110, so the 72" is perfect.
This may go without saying, and although their stuff is good quality, the Tractor Supply stuff is simply not as industrial as a Woods or Frontier (which is just a rebranded Woods), etc.
The air ride seat would be nice, but the pneumatic thing works perfectly fine for me.
Dual mids come standard, if you do have a rear SCV (remote, aux hydraulic, whatever you want to call it) it would be a big bonus. They are a lot cheaper from the factory.
I would highly recommend looking at a loader. No tractor of mine will be without one. Right now, you have a really nice, really expensive lawn mower, add that loader and you'll have a full functioning tractor. Know what your saying about the $$$, but if you can swing it, you'll never look back. As far as a price difference, there really isn't one. When I was looking I wanted a 33 or 3520 with a 300CX loader. I only ended up with the 3120 because it was a demo that came with all the other benefits of new with a couple of hours on it. Priced was way lower than the others, not in the same ball park, and it came with the 300X. For a couple hundred more you get the quick attach frame and more capacity, no brainer if your getting a new one IMO.
I've seen a couple of them tinted for sale, and they do look really sweet. Hope all turns out well!
As far as the air horns go, I have myself a little collection.
