I have an older Cannondale with the Shimano 600 series (grey) parts. Was thinking about using the parts in building up a new steel frame. Is there that much difference between newer Ultegra and the older 600 parts? Beyond the fact that the older parts have had some use? The Cdale is 7 speed, what would I need to change with the original components to make the new frame into a 9 speed ride?