well i ended up getting a whte macbook and the orange speck case. the only non snug area is at the bottom of the top peace near the hinge, an the back corners are just a little off.
I got it because I will be using the MB with an Eddie Bauer backpack I got from Target.
Eddie Bauer® Backpack - RDMND up to 15" laptop, nice rear lined pocket with straps, has a pocket for cords at teh top, and has plenty of room for accessories. I will probably see about stiffening the rear of the back pack with a cardboard insert, but it is otherwise perfect for my needs.
BTW they are on sale right now for $35, $15 less than I paid 2 months ago.
Messengerbags are far too small to carry 4 classes worth of books (ithin I have 2 fullsized 2 medium and 3 small books,) A ringbinder notebook, a blackberry, and a computer for long distances. I'm not as concerned with fine scratches as I am not planning on selling it sans cover, and it would get scratched anyway in daily use. (just looking at my poor blackberry after only 2-3 weeks)