I've got a mini-Metro that I've been using for the past three years... and really like it. Just the right size for most of the stuff I have to pack around, and pretty comfortable on the bike or on foot either one. Like others, I bought a Metropolis first, but that turned out to be a little bit big... Still have it for odd loads, but the daily bag is almost always the mini-Met.

As for colors, Chrome makes these things in odd batches. Keep checking the site, and eventually they'll come up with a color you like ;-) My Metropolis, for example, came out of a batch they did in blaze orange; the Mini-Metro is hi-vis chartreuse.