Personally I'd strongly not recommend anything larger then the original selection!!! 3 acres is tiny, and even the potential extra 4 acres doesn't add much. The unmaintained road after you've done the hard work the first time all you'll be doing is basic maintenance to it that won't be much work at all. And it's flat, so not like it's going to get washed out. And it's in Florida so you're not getting piles of snow to clear off it...
For perspective I run a ck2510 on 10 acres and it's far from flat, my neighbour runs a ck2610 also on 10 acres. Having operated both on our properties I know if I had to replace my tractor I'd not move up in size to the ck2610. (or comparable in any brand.)
My tractor clears snow, (3pt blower & blade on loader) does a ton of loader work (both bucket and brush bucket with thumb), pulls a trailer with ease, runs a backhoe, runs a 3pt wood
chipper, runs a 5' 3pt finishing mower, the list goes on. And I'm running loaded rear wheels which I strongly recommend, turns the tractor into a little monster. Sure you can hang something off the rear to use as a counter-weight for loader work but that gets annoying - in tight quarters it limits your manoeuvrability, (trust me I know) and if you're say loading a trailer which you're then going to pull that means you're constantly taking whatever is hanging off the back on and off constantly...
Oh and technically I did replace my tractor! I had a ck20s and last fall replaced it with the ck2510 cab version. Wanted a cab for winter and wanted hst - actually that's an important point given the discussion above about 2 or 3 range. The gear version I would not recommend, definitely go with the hst version. I loved my ck20 and would never have replaced it but for that tranny which is why I replaced it after having it for over 9 years. If all I was doing was field work the geared version would have been fine but doing a lot of loader work it is not optimal - real loader work meant being in low range and reverse in low range was too slow. The hst in low range is much more effective and most of the time I'm operating in low.
Last comment - financially consider that if you go with a bigger tractor every attachment costs more so your total cost of ownership is a decent percentage more.
That's my 2 cents. Oh, lol, one last comment - ya I've talked about Kioti above and after 10 years of ownership I'd happily recommend the brand. But frankly I don't know that you'll be unhappy with any new tractor. Before I bought my Kioti I wanted a JD - I grew up working on farms and most of what we ran was green. (farming - that's where you need a big tractor.) But when I went to buy a tractor 10 years ago money talked and I ended up with the Kioti. At the time I saved about 10 grand over a comparable green tractor! That was an easy choice.
E.