If he's really into music and iTunes and maybe even redoing music (Garage Band program by Apple), and if money is not a problem, the Apple MacBook is really great for kids. They have their base basic model for $900 and its available in white as well as anodized aluminum. Has a battery that lasts forever and a nice screen system. Great for music and photos. You can get a remote control for them for $20.00. You can also load WinXP on part of the HD as well so it can run normal programs also.
This way, if he is an iPod person, he will be 'fully' iTunes...
Just an idea. $900.00 is alot for a basic computer, but I can tell you that Apple is a very high quality product. Even their basic laptop is a very nice laptop filled with good software.
Bill