Welcome to TBN. You say you have 1 acre of sand. What kind of sand, where? That could make a difference in what you want to buy because of the differences in weight between models.
I have a sandy type soil here in NE Florida, and find that my CK20 is just fine in almost all but the wettest conditions, and it weighs about 600# more than the Kubota, which gives me a little better traction. For moving dirt around, leveling, pulling trees, digging stumps (with backhoe), etc., it has been a GREAT tractor. I have the HST model. I like the platform style of the CK better than the ladder frame of the Kubota, more comfortable, more room etc.
I suspect, if you never plan to do anything more than you stated, you could go with a sub cut like the Massey, kubota, or NH, but the CK20 is a small-frame CUT with plenty of capability for when you realize there are lots more jobs you want to do than you're thinking of now! John