The GSM Hero, with the chin was succeeded by the Legend in Europe and Canada. They both have the same form factor, and are in the same price range. The Sprint and other CDMA Hero's as well as the Droid Eris are all part of the same Hero class, because they have nearly the same specs. The US sucessor to these phones is likely the HTC Aria.
Because the Hero was so slow, however, HTC made the Desire line, which some people say replaces the Hero line. The Droid Incredible has the same specs as the Desire, so thats the US equivalent.