Make sure when pricing that you are getting quoted for the auto connect PTO. There is ambiguity in what exactly constitutes an "auto connect" mower deck. All one series MMM decks are drive over, auto connect. You can optionally also get the auto connect PTO so that you don't have to connect that part manually.
It is plausible that you could take delivery of your deck with the "Auto Connect" sticker plastered on it, yet not have the auto connect PTO hardware to go with it. It is a separate item.
Also make sure that you are getting the quick attach bucket on your H120 loader. For that matter, make sure it is the H120 loader and not the D120.
The 53" bucket is worth considering. It should be about a $50 upgrade from the 49".
Make sure you know the differences between "Mechanical Lift", "Hydraulic Lift" and "Independent Lift". Mechanical Lift is standard, and if set up properly, works wonderfully. Don't let them sell you a $1,000 Independent Lift, chances are very good that you don't need it - or would even benefit from it. I could make an argument for why it is not as good as the standard mechanical lift but I don't want to ruffle feathers. Just make sure that if you are going to get it, that you know what you are getting, and that you will actually benefit from it.