Thanks again to all for the thoughtful input. I'll definitely check out that Giant bike series.

Classtime, I'm not totally against a single speed, but was thinking of turning the commute home into an occasional longer workout.

Incidentally, kingston, that's one of the reasons I'm planning to ditch bikeshare. The others being annual cost that could go toward a nicer bike; inconvenience when running errands on the way home away from docking stations; and lights being inadequate during the winter months on the bike path. I'm a huge booster for the comfortable/bombproof bikeshare bikes, and their racks, fenders, and lights!! But I think it's time to upgrade.