On Cadillacs, the Hondas, and the Yugos, I don't see the point of standardising on Yugos. As far as I know, the sites with the Cadillacs aren't pushing to get rid of them.
I'd suggest letting the Cadillac sites stay with what they already have. If designer-time and programmer-time is the issue, consider that it takes more resources to switch Cadillacs to Yugos than to leave the Cadillacs be. The designers did an excellent job with the Cadillac sites; the effort has been expended to good effect. Don't waste that effort.