Topshop,
The 3830 is only marginally larger than the 3130 and only slightly heavier. If the 3830 is too big then the 3130 is likely to also be too big, they take identical accessories for the most part. That said, I am content with my 3130 HST machine. Put the bucket against an imoveable object and it will slip the R4's in low range and thats with the BH90 on. It will dig all day and not complain. The BH90 also is a brute and the machine doesn't know it's there at 2300 rpm.
The 3130 is a lower horse power larger tractor that works for me. I'm not a commercial user, if I was I would have a big yellow something instead. I dig holes, stumps and do some pile moving and grading and I sometimes use it to bring the squirrels in. I don't use it to cut grass or till or plant or spray, these uses I can't comment on.
You having 80AC may find it a bit small depending on the intended use. Just MHO.
Best of luck,
Martin