And the winner is... Cannondale Quick 4
Thanks to whomever recommended looking at the Cannondale Quick for my commuter bike. Bought one today on REI's f&f sale and I think it will be just the ticket. Tried 7 different bikes over the last several weeks and this one was clearly the most comfortable with great shifting and good brakes. On sale it fit my budget ($500). (Note it was less windy so I managed not to be blown off any bikes today.)
Quite an upgrade from my purple Huffy bike. Let's see how long it takes me to be ready to do the whole 16 mile ride to or from work. Plan is to take it by car/bus to work, ride at lunch for a few days, then ride home. But first I must do some, er, seat conditioning. Bought a fancy new girl saddle. That might reduce the posterior break-in time.
I'll keep you posted!