mic -> ibook ??? Options

[mavel]

hello,

i got a few questions:

1.i want to know what i have to do
to record my voice via an external
mic with a new ibook, which has only
usb for input.

2.how can i achieve that i can
hear one track via headset and
record a new track via mic.
does it work with usb?

3.would you suggest me to buy a new
ibook(with usb input) or rather
buy an used powerbook(which has an
mic-in). my main interests are in
design an multitrack-recording.


thanks a lot for helping me!

mavel