The best earplugs you'll get are "Musician's Earplugs". They reduce the noise by 15 or 20dB (depending on the model) but they reduce it evenly across the frequency spectrum which means everything sounds like it should, just quieter.
They are custom fitted so you go to an audiologist and get a mould taken of your ear and they make them to suit which means they fit perfectly and are comfortable for hours of use.
The downside is that they are expensive and take a week or two to get made.
I got a set made years ago when I was running sound-off competitions and they are fantastic.
Check them out:
http://www.elacin.co.nz/music%20protection.htm
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