OK, here is my situation. I am starting to get more serious into lawncare. I have a 21" push and a 42" rider(walmart=hell yea!) But anyways now that i am getting bigger my equipement is getting really old. Well, my question is is that i am going to be doing more lawns this year. Some have big fenced in back yards that only a 36" can get through. But others are bigger and have no fences. So what should i do(bye the way i mow residential and have a commercial coming that is fairly bigger and it is my dads company)? Should i stay with that trusty old 21" push to mow those huge back yards, or take a used lazer hp and ditch the old wlamart mower??? Any input on this would really help somewhat of a newbie out!!!