My two bits? I'd have the bike shop install Shimano Ultegra 10 speed onto your Bianchi and then ride it to death. It is almost impossible to find a better bike then you already have for the commuting you're doing.
If the bike is beat up, have the bike shop strip it down and have it powder coated and then put on new components and a set of Mavic Equipe wheels. It will cost you about the price of a pretty good new bike but then if anything happens to the old frame you can just buy a new frame and use all of the components on it.
Last edited by cyclintom; 01-03-06 at 08:31 AM.