Robert,
I have used a pair of them for 6 months now.
If I were in your place, I would not hestite to buy three NX5U cameras.
You can record in SD mode, which stores it as mpeg2 on your storage.
If you want to do a multicamera shoot, you can plug into the composite output to your switcher.
If you want to go HD, just swith a setting and you are in HD.
You can choose the HDSDI output jack and connect into a HD switcher, if you want live switching.
I purchased the storage device, I think it goes for $1k. I love that feature so much for my workflow. However, it is detacheable , so if you are afraid of a student absconding with it, just have each student bring there own SD cards.
John Lenihan
LeniCam Video Productions
https://www.lenicam.com
John Lenihan
LeniCam Video Productions
https://www.lenicam.com