I’ve just ordered 5 H10 iRivers. The H10 is a 20GB mp3 player. Here’s a pic. I chose iRiver because, unlike ipods, you don’t need other accessories to record, as they have an inbuilt mic. They are also a bit chunkier, which is good for being handled by a lot of people at school, and they can’t get lost as easily.
For the techheads out there, here’s a full list of specifications.