If you’re planning on using the mixer board as part of a class, to teach broadcasting or what-not you may want to consider Mackie. A simple 16 or 32 channel mackie mixer is great for learning on and also functions as a great video studio mixer. Also, the Mackie mixers retain their resale value when used nicely, thus allowing your school to retain their investment should they choose to upgrade to a more complex piece in a couple years.
I’ve found them to be quite durable too. Since they are quite common, most audio techs are already familiar with there set up conventions as well.
