There are some pretty slick, lightweight hybrid bikes around. My dad recently got a Fuji Sunfire from Bikes Direct. I rode it around a few times while helping him dial it in, and dang if that thing isn't quick, and a blast to ride. Did an unofficial lift test with it and my road bikes, and although it was heavier it didn't seem like by that much. If I could have only one bike that one would be around the top of my list.