as for the Macbook, well my friend, medicine student, bought a white one, and the screen on that is POOR, and my other friend, she's a solicitor, bought a black one and the screen on that was also poor... i'm disgusted at Apple really... my old iBook 12" has better screens and it was the entry level monitor!!!
I agree about screen quality being a major factor in how pleasant a computer is to use. That's why I can't see this NEC LCD20WGX2 being replaced any time soon for my desktop, even though I do fancy a greater resolution.