I understand you want a 30hp tractor with FEL and the ability to blow snow and move stuff around in your shop. And I also understand that you want to plant 20 acres of crops eventually. And you have 1.5 acres to maintain, which is really less than 1.5 acres, once you subtract the footprint of the house, outbuildings, driveway, etc... its not that big.
Its not about cheaper, its about functionality.
What I'm getting at is this....
I was in the same boat. We had an 8000# 50HP tractor loader with a cab out on our 20 acre tree farm 9 miles away with a brush hog and box blade and we had a riding mower at our house with about 1 acre of lawn. Once I figured everything out, and the heavy excavation tasks were completed at the tree farm, we downsized and went with one machine to do everything, with the goal of eliminating as many machines to maintain as possible. We now have one machine that mows our house lawn, plows our snowy driveway, moves things around in our garage and on both properties, does FEL work, brush hogs trails, moves firewood out of the woods, etc.... The only difference between your situation and mine is that you eventually want to plant some field crops that will require a larger machine, and my crop was planted once and won't get harvested for another 20 years.
I'm telling you, in my experience, a lawn tractor on that small of a piece of property makes much more sense than a 30hp tractor with a belly mower. That belly mower will get in your way while doing your other tasks more often than not, it won't get into corners and tight spaces like a riding mower will, you won't be able to pick up grass clippings or leaves with it without very expensive attachments. The several thousand pound tractor will also compact your lawn, especially around flower beds, driveway edges, etc... My guess is you'll still need to purchase a walk-behind mower to get into the spaces the 30hp tractor won't fit in.
So, if it were me, I'd skip the 30hp machine all together. I'd buy a riding tractor and a tow-behind cart for $1500. I'd buy 2.5 ton pallet jack from harbor freight for $200 to move things around in my shop. I'd buy a good walk-behind snow blower for less than $1000. And then I'd worry about a larger tractor if and when I finally found a large piece of property to buy. Then, once I found my large piece of property, I'd buy a used utility tractor to do my planting. If I then decided to build a house on the larger property, that's when I'd go for the 20-30hp machine with FEL, snow blower, etc...