I have a NH TZ24DA. I bought it in 2004 and it's been great. I have 7 acres but am planning to start farming herbs on 3 acres. Would my NH do the job? Would I be overworking it? Should I consider an upgrade and if so, what? I would stick with NH over JD, although JD is better and perhaps more reliable, it is much more expensive too (just for the name).