ugh, i've had so many and still looking for the perfect one. these are the only ones that come to mind, i've looked at many more and bought a few others i can't think of! if you're shopping i'd suggest you feel the bag in person, it would have saved me a lot of time. as an example i always thought the jack spade bags were nothing special, but they're not bad. i wouldn't pay full price but with bluefly or ebay i think it's quite reasonable. so lesson is to handle the bags in person to really get an idea of what they're like.
timbuk2 medium classic (from 1996, it's so old it's not as stiff as the new ones, not sure if that's because a change in materials or age)
Yak Pak Sling (too awkward)
timbuk2 metro (too small)
timbuk2 toeclip (canvas, single panel, smallish day bag)
jack spade leather day bag (i wanted something leather, and i like the varvatos bags but at that price i needed it to be suitable for work too)