Notes in class: eMate.
Notes plus everything else: MessagePad 2000/2100.
Notes only: you'd probably get by with a MessagePad 130.
I wouldn't go any lower down than a 130 unless for a collection, and if possible, I'd go for a 2100. For the extra $30 or so, it'd be well worth it.
A keyboard is available for the MessagePads, but for the 2000/2100 you'll need a dongle to connect it — expect to pay nearly as much for it as for the MessagePad itself — or else wire a suitable serial port into the unit, which can also be done. There are guides out there for the finding.
Notes plus everything else: MessagePad 2000/2100.
Notes only: you'd probably get by with a MessagePad 130.
I wouldn't go any lower down than a 130 unless for a collection, and if possible, I'd go for a 2100. For the extra $30 or so, it'd be well worth it.
A keyboard is available for the MessagePads, but for the 2000/2100 you'll need a dongle to connect it — expect to pay nearly as much for it as for the MessagePad itself — or else wire a suitable serial port into the unit, which can also be done. There are guides out there for the finding.