We have been pretty satisfied with the Momentum line of bicycles from Giant. The "Street" model is just about all a person needs to get around town and pardon our French but a hell of a value at $425. A couple weeks back we decided the only thing that would make it more ready for commuting is a set of dynamo lights. We're big fans of dynamo lighting- secure, always-there lights with no need to worry about charging and more illumination than most mid-priced battery lights. So we set up a Momentum Street with a Shimano Dyamno -equipped wheel and a set of B+M lights. The Shimano hub is a disc-ready model in case someone ever needed to transfer the system to another bike, and we also equipped the hub with a Pitlock lockign skewer, which is just about the only truly theft-proof system on the market. The EYC front light is tiny and BRIGHT!, and the rear Secula fender-mount light has a reflector plus a bright ring of LEDs.
The best part about the package is that it can be had for $675. We think having good lighting is imperative for commuting, and this balance of bike cost/light cost is pretty reasonable for someone who rides to work year-round.