The Atari ST was a joke, it did not make any headway until the TT and Falcon. on that Note Gianna Sisters sucked on it too, the screens did not even scroll!!
The Amiga version on the other hand was just as good as the C64 version, but with updated graphics and of course without the SID based sounds which I did miss.
As for a DS version, I am totally hyped, I was just wondering the other day why certain games are not around still to this day, and I was thinking they need a port of Gianna to the DS, not to mention System Shock 1, which again seems to have been designed to the DS since day one!!!