The Heritage Edition is a cool frame but I'm not really too into seeing a seat tube cutout on a steel frame.

The difference between the 725 and the 735 is the size of the tubes. That's it. In my opinion, the 725 is better looking. I've never seen the Dodici Polo, so I don't really have an opinion on it.

There's a dedicated Retrogression thread in the marketplace. Please keep any questions about products and whatnot posted there, as this isn't the place for discussing such things. Thanks.