The TCRw comes with a compact double. The LBS guys said they could swap it out for a triple and install it for almost an even swap. So the decision really comes down to preference, not price.
I am 33, haven't been on a bike in 20 years (yeesh!), and would say I am average fit (just finished a 25k xc ski marathon with Team in Training, as a total beginner Dec 06 - but I am slooooow - and not terribly coordinated). Short legs. 5'1. Have probably 15 pounds that need converting from fat to muscle.
