If you have been riding for that much and also have been leasing, then you probably know a lot about horses. Because you jump I would recommend a thoroughbred, of course, a gelding (or mare if you like). If u want a project horse than buy a horse that's a bit younger then you want it to be. If you want a horse to be just right then I would buy a thoroughbred that's about 6 to 10 years old. It's totally up to you though.