The choir director isn't an administrative position and it doesn't sound as if any budget has been allocated for this. If the money does exist, it is much more responsible to counter-propose a more effective use of the funds than to rattle off a few product names and price tags for someone to go buy.
I've been an adviser for capital projects at the local arts center which is attached to a high school. I play this game frequently. Most everyone in this industry plays them game frequently. Somebody says, "Let's do X to achieve Y", and then someone with better background in the matter says, "Actually, X will give you these problems over time. Let's try Z instead and let me tell you why it'll be a more effective use of your funding."
Professional designers know this. Directors ask for a lot of crazy things, and sometimes they're the right flavor of crazy to begin with, but a lot of the time the designer needs to reign them in a little bit and lead them down a different path to achieve the initial goal through better means. Blindly saying "Yes" without seriously considering the consequences of those actions is irresponsible.