I would point you at the Cannondale Bad Boy line. In particular, I would look at the bad boy 9. No, I do not have one (yet) however, I see it has having plenty of features that I would look for on a commuter bike.

Wide, but street oriented tires
Flat bar (debatable)
disc brakes (depends on where you live)
no suspension to rob power
mounting points for fenders and a rack
cuff protection disc on the chain-rings (a chain-guard would be better; but they are rare on bikes with standard gear sets)
plenty of gears

There are plenty of similar bikes