I don't need superb expansions for my Amiga CD32. Actually it's ok of what it is. Probably a 030 for some 3D vector games will help (Guardian, Subwar etc)? The only serious problem about some CD32 games is that they can't save, because the free space Commodore used for saving games and hiscores is really tiny.
Take for example Theme Park version. On CD32 is useless, because it saves only your money and nothing else. So everytime you start it to play again, you have to construct everything from the beginning.
Too bad that it can't be changed.