Hello Melissa Sigler,
I would do my homework on this one, first. Check out all the options in person for myself, and see what the clients like, also.
I like Jocelyn Martin’s idea of having the clients get their own. They will do the lugging, which is good exercise, and pick out what is comfortable for them. Everyone will most likely pick different styles and weights which can be shared during class.
If you must purchase the equipment, I would go with an adjustable set that I like since it will be my responsibility and product.
NAPS 2 B Fit