Regardless whether it is English or Western, keep is as simple as possible. As long as your ponies are trained, they should be able to go in a snaffle and as simple a headstall as you can find. I would avoid the Asian made leather due to the lack of quality of the leather. Hopefully there are some good quality used ones where you are.
BTW, you didn't say where you are - that could make a difference in what is available.