Daytona became Centaur, so if you replaced everything w/ Centaur you'd essentially be staying at the same level of components. One thing to keep in mind is that the "multiple-shift with the thumb lever" option is now gone unless you get either the Record or the Chorus brifters. You can mix-and-match components -- i.e., Chorus brifters will work just fine with Centaur derailleurs, for instance.