EWC,
Your place is very similar to mine. I have 18 acres and am in the process of turning the ex-cattle pasture into something I can be proud of.
I went with the L3130 HST for several reasons (delivery is Thursday). I felt that once I cross fence the property, my largest pasture will be 5 or so acres. By rotating the stock, I'll only need to mow one pasture at a time. With that in mind the L3130 will handle the mowing chores with ease. If in the future I get a chance to purchase the 18 acre tract behind mine, then I'll still have enough tractor.
The L3130 isn't a large tractor, but it is bigger than some of the other compacts. It is a consideration. In my case, I haven't built the barn yet, so I'll just need to make sure the tractor fits when I do.
My suggestion to you is to test drive each of the tractors. I was amazed at how tight the turn radius was on the L3130. That combined with power steering, tilt steering wheel, 4WD, HST, and R4 tires gave me a package that will make the farm "chores" more enjoyable.
Good luck with your decision and let us know what you decide.