I think you might find that there's more maintenance with a SC than a turbo. Once the turbo is in place, you don't need to do much to it. An SC will require occasional belt adjustments, which can be a pain. Not the same set-it-and-forget-it as an alternator belt because of the amount of drag.
I guess I'm not sure about the 'cold turbo' part, because I don't have any personal experience with the centrifugal SC and their thermal efficiencies, but having used both a roots-type blower and a turbo on another car, I can tell you that the hype over SC thermal efficiencies versus that of a turbo are untrue for the most part. Any time you compress air, it's gonna heat up. Physics 101.
To each his own. I guess I'm just a fan of turbos. They're stealthier (less noise), require less maintenance, and they're smoother.
[This message has been edited by gjones (edited November 16, 2000).]