I thought I wanted to maintain one machine for mowing and tractor duties myself, but I was very disappointed with the results. I bought a set of turf tires (to swap my ag tires which I don't usually need in the summer), and a 6' 3-pt finish mower. My dealer said that unless I have a perfectly flat lawn, which I don't, a 7' mower would not work well. I took the loader assembly off so it was just the tractor weight and the mower deck.
Didn't do too bad, but didn't look as good as it did when I used my old Ford front mower (sad I couldn't find parts to keep fixing that). I have a country lawn as well, so as long as the grass is cut, I don't need it to be perfect, but I like it to look nice. The biggest issue I had with it was that it took me a lot longer to mow than it should have, and definitely longer than it took for my old front mower. The tractor simply does not have the turning radius that a purpose built mower has. Not to mention, it forced me to mow a few sections one way only, and started leaving imprints where the tires rode after repeat mowing.
I ended up getting a great deal on a Jacobsen Turfcat, and I haven't looked back. Much better mowing quality, more maneuverable, lighter on the lawn, and much faster than the tractor. It seems more economical to maintain only one machine, but it didn't end up that way for me.