I want to get a riding arena. I was thinking indoor, but then I saw a few prices for those, and blew the idea off. Well, I was thinking maybe I could get an outdoor riding arena. I would like crusher run footing, and a wooden fence. (The fence doesn't have to be very strong.) But I don't know how deep the crusher run would have to be, and how big the arena would have to be. (I would like to put a few jumps in it.) Any ideas on this? I would like to spend under $1,500. Is that reasonable?