Most of the ports I can think of have aural rather than graphical enhancements over the respective floppy versions, as they are AGA on CD32 and A1200. Ones with kickass music that spring to mind are Guardian, Pinball Illusions and Super Stardust. They are also cool games.
Shadow Fighter CD32 is excellent too. Base Jumpers is another fun game with good music, and the CD32 version has extra subgames.