Do you have any of your old bikes?
I'm currently riding a used '84 Bianchi Specialissima with a '01 Campy Carbon/Ti Gruppo. Quality Steel lugged frame with a modern twist. Threw on a carbon fork and it's a real nice comfortable ride that can put the power down. The cost of a new gruppo is all you have to worry about.
I still have all the original Campagnolo Record parts on another Bianchi. Just in case I want to fo totally Retro.