If you don't like electric, then I'd go for wood or save up for vinyl for the arena. Vinyl is no maintenance, wood can be very high maintenance. I see a lot of folks around hear using striplings, they put the posts in the ground and go find a young cedar tree (not native to OK and a real PIA), cut it down, strip the branches and put it as the railing on the fence of the arena. Very rustic, practical and free. If you have something like that in your area it could be a very low cost alternative. If not, then maybe going to Lowes for landscape timbers, they're usually $3-4 each and would make a nice, sturdy arena fence.