I've tried the squishy sponge types of different varieties and some of the rubber plugs with ribs and a device at the end that just lets certain frequencies or levels through. I'm not sure which. I didn't like either type. I feel too removed from the music and sonic environment. Of course going with out I'm hating myself at the end of the night because I'll have ringing for two weeks.
I wish I could find something I liked.