MIDI Controllers:

My classroom favorites. I use these in my 9-12 iMac Lab/classroom:

M-Audio Keystation 61ES 61-Key Semi-Weighted USB MIDI Controller

For younger grades, ask about the M-Audio Keystudio 49-key USB MIDI Controller Keyboard.

Great for laptops or itinerant classrooms. I use these in my laptop lab classroom

Korg MicroKey 37-Key USB Midi Controller

I carry a nanoKey2 everywhere I go.

Korg nanoKEY2 Slim-Line USB Keyboard, Black

Korg nanoPAD2 Slim-Line USB Pad Controller, Black

A multi-input controller PLUS :

M-Audio Axiom 49 Advanced 49-Key USB MIDI Controller, 2nd Gen

For a bit more money, go for it!

M-Audio Axiom 61 Advanced 61-Key USB MIDI Controller, 2nd Gen

My all time classroom and personal-use favorite headphone:

Sennheiser HD-280 PRO Headphones

Industry standard for recording studio playback:

AKG K240MKII – AKG STUDIO STANDARD SEMI OPEN 55OHM HP

Industry standard for live mixing & DJ:
Sony MDR7506 Professional Large Diaphragm Headphone

Headsets with microphones

Beyerdynamic MMX 2 PC Gaming Multimedia Digital Headset with Microphone

Sennheiser HMD 280 PRO – Professional Communication Headset for High Noise Environments