I love Silent Hunter to death and would buy them all if they came to GOG.

Definitely need 100% offline installers for the Silent Hunter series, none of that 'internet required to play' hogwash for what is mostly an offline single player game.

I have the retail editions (non-Steam) of Silent Hunter III and IV, worth looking out for as it doesn't require an internet connection to install or play. Just be sure not to get the Steam version in disc format (read the small print on the back).