Yeah, that sounds about right I guess. Actually it's less then I would expect for a 105 equipped bike. Where you expecting more or less?

My '04 58cm Trek 2200 with FSA Carbon Pro Team Issue cranks, Chris King/Velocity Aerohead wheels, Speedplay Zeros, Terry Fly Ti saddle and Tacx cages weighs in at around 18.5lbs. for comparrison.