I use the Etymotic Research ER20 earplugs while drumming and at shows. I had been using Hearos Hi-FI plugs for the past 4 years and honestly can't tell a difference between the two. The ER20s were cheaper so I bought an extra pair to keep in the car. Just my experience.
However, I would like to get a custom pair sooner than later, hearing is one thing I definitely value.