I love my E5's. I traded my Etymotics in for them. The etymotics are also great. For custom earmolds, you can try the ear plug superstore (http://store.yahoo.com/earplugstore/index.html). They are a pretty economical way to get earmolds as you take the impression yourself. I did this for my etymotics and they did improve the sound and noise isolation considerably. I have not done this for the Shures--but I have been enjoying them with the provided triple flange for the best seal and sound quality.

Mike