My primary commuter is a CAAD10 and comes in at 19 lbs. I commute with a backpack so no rack or panniers. We rarely get rain in California so no need for fenders either.

On the one day a year we get rain, I just ride my heavier CX bike and enjoy a little spray and mud. That makes it fun when I clomp through the lobby of my building on my way to my office. Security guards give me a good look as I walk by.