Technology is a bit of shell game shrouded in marketing. If you track the lineage of gruppos from Campy...which incidentally are my favorite...basically what they do is change the paint jobs and names and each year move each gruppo up a partial or full notch. An example is '07 Centaur is now pretty close to '06 Chorus. The rub is...you can likely find an new '06 Chorus gruppo for less money then a '07 Centaur...and it even may be fractionally better...lol.
George