You'll be glad to know that I couldn't care less about whether you have the rights or not. That's the school's problem, not ours, and not even yours. As to the answer to your question, "it depends" is really the only "right" answer. You also get what you pay for. There are a ton of factors in selecting a
microphone, and that's only the tip of the iceberg in what you're doing, so I'm not going to just
throw out model numbers. I would suggest, though, that you do not rely solely upon a single (or even pair of)
microphone(s) as your only source. Hanging a pair is a good start, but you'll want to add in spot mics to fill in the holes. This isn't impossible to do with your setup, but it's going to eat up a pair of auxes to get stereo (which I would recommend) and will require balancing the recording mix on the same
console as the
house mix. You'll probably be mixing on
headphones, so you'll want a good set of closed back phones and you should also learn how mixes translate from
headphones to speakers, both in stereo and
mono.
As far as mic selection, first you should start with what
pattern you want. How does your room sound? Do you want to capture the room with an omni
pattern or do you need to try to eliminate the early reflections and standing waves from the recording? Next (and also corresponding to the above decision) is where will you place the mics? The only real way of making this determination is by listening in various places. Although, you may also be limited by what kind of rigging structure is in place. By the way, how will you rig the mics to ensure that they don't fall on someone's head? Again, I don't care if you get sued by a parent with a cracked skull just like I don't care if
ASCAP comes after you, but you might want to take it into consideration.
There's really quite a
bit to it, enough that what I'd actually like to tell you is that you should keep hiring the professional to do the job, but I know that's not what you want to hear so I thought I'd
throw out the distant second advice. Good luck with whatever you decide upon!