How about SIG rascal 40 as trainer
Just my opinion but the hangar nine superstick 40 would be a good choice. I didn't use it, but I taught a buddy of mine with his and I have seen a couple of guys at the field use them as trainers. Replace the stock wing bolts with nylon - real easy to do. Good thing is you don't have to mess with rubberbands and when you learn to fly you already have a second plane. The planes are tuff. The covering is not real good but they are easy to recover after a few dings. I think you can get one for about 120 bucks. If I were going to do it again I would go with the superstick