Thanks, everyone.
For the moment, the Manbag looks pretty good. I may try to find something a little nicer (possibly leather, like Bitt originally suggested).
The Timbuk2 bags, as well as the CrumplerUSA bags are all pretty bad colors, unless I were a bike messenger.
I like how that DJ Handbag has teenage girls posting about it

xxaznprincessxx said "I just got the DJ BAG! It is so cute!", and another said "its a great little bag, perfect for all your makeup or school supplies, or whatever."

Definitely a guy thing

The writer notes that it was probably designed for women, though. It looks like a nice thing to start with, though, because at $9.99 it's hard to argue with.