Well first
is this for college? is he gunna be carrying it all day or something?
If this is for college and typing of notes in class, yes go notebook!
If this is going to set on a desk and function as a desktop 90% of the time and he may take it off that desk once.. or you only want a netbook so he can walk around the house with it. Just go for a desktop!
The only reason I am mentioning this is because, (and this is my opinion I am not denying it) but, laptops are way oversold.
You get far less power than a desktop of the same cost, and everyone gets a laptop because its "mobile" when I know a lot of people (I am guilty of this too!) who just leave their laptop on their desk and it never moves once.
Plus the problem with laptops is they suffer a lot of wear and tear because, if you *are* moving them, the plastic heats up, then you move it while its warm and it becomes brittle quickly.
You could probably get a good 5 years out of a desktop or more. The problem with laptops are they can physically tear up long before they are obsolete.
*edit*
And I know not everyone agree's with this.. but, you may as well get the most powerful machine you can for your money. Just because all he does is watch wwe flicks now.. doesn't mean he won't have need for a more powerful device in the future.
So, if it is for college.. save his back and get a netbook.. if it is going to just be in the same place most of the time anyway.. skip the laptop and get a decent desktop.