Hay equipment is not cheap and, from what I have heard, can require a lot of maintenance. I'm not sure the time and effort would be worth it for you for that size field. I recently cleared 6-7 acres of my property and considered haying it. After factoring in the equipment costs, know how and luck required I decided against doing it myself. There is an Amish farmer who lives down the road who is going to do it for me and we are going to split the hay 50-50. My land, his equipment and knowledge.