What color do you like?
Do you like the safety and features of a newer compact diesel, or like tinkering with an older gas tractor?
Live pto started in the mid 1950s, depends on the model.
Dad ran 200 acres of crop ground with 50 hp, neighbor ran 80 with an 8n, what do you want to accomplish with your tractor on 40 acres? Hay, or pasture, or landscaping, or firewood processing, something profitable, or just basic trimming and play?