yellowman-
i have the STM small alley bag (olive) for the macbook and i am very pleased with my purchase. i have looked at the crumpler bags and you mentioned that it is stronger and more sturdy, but how strong and sturdy does it need to get?
personally, i cannot say much about the crumpler bags since i do not own it (but it looks a bit too big and loosy for the macbook?). but in regards to the small alley bag, you will not be dissapointed. and what other "computer bags" would you prefer? targus? psh, if you have a boring office job.
STM for the macbook is very stylish and small, yet offers PLENTY of pockets (velcro,zipper) front, back, and inside. and if you ask me, it looks pretty darn strong and sturdy. plus, for $40, you simply cannot beat it.
good luck!
p.s. i think STMs are much more appealing than crumpler bags. they look like baby tote bags. and what's up with the name?!? cumpler?