Ahhhh, I fancy throwing a spanner in the works..
Not sure why 90% of this thread is recommending a Macbook?
The average user (as you claim to be
) on average would have probably used a Windows operating environment more often than that of OSX (if at all in some cases).
Meaning that they will be more accustomed to the setup, running and general use of the GUI and OS.
"Clunkiness, speed and crashes" as has been previously described etc are more often than not user error within said environment (not all admittedly, and Windows is notorious for it).
But... How can somebody with no previous knowledge of an operating system, use it quicker and easier with less stress than that of a piece of software they have been using for x amount of years?
OSX is vastly different to Windows XP, Vista and 7, in many ways. Even such things as the keyboard will have different keys that you will have no idea what the symbols on them mean.
Its more down to what the user wants it for, than what is the best thing on the market at this point in time. I think thats what people may be missing here? I may be wrong.
For Internet, iTunes and burning CD's your standard W7 lappy will be more than adequate!
I say keep it simple, buy your bog standard £300 - £500 laptop and be done with it.
Some of the suggestions in previous posts would be worthy candidates..
You wont have to worry about it being second hand, so warranty etc wont be an issue, keep it simple.
Hope I have been of some help..
As I know I am not your favourite person for obvious reasons (Top mounts)