So I wanted the best clamps, and decided on these "Heavy Duty" ones.  They are crazy strong and heavy... you may not need something this tough.  I bet most everyone can get away with using the lighter duty clamps by Chauvet.  Although, I'm very happy with them, you might be able to save money with the cheaper ones.  You can also just buy bolts with wing nuts at your local Hardware store and use these with the same outcome.