I can vouch for the awesomeness of the ER-15s. I got them last year, and while they aren't as comfortable as foam plugs for extended wearing, they sound excellent. It's possible to understand conversation from some distance, unlike foam.
If you go that route, go to an audiologist. The mold making process would be difficult to perform on yourself, to say the least. Probably good to leave the en-gooening to the professionals. After the molds are made you'll have to wait a couple of weeks, and then go back to the audiologist to make sure that they fit, and if the audiologist is cool, a full hearing test to make sure that the response is
flat.
The whole thing cost me $150, but after having lots of fun with my ears as a kid, I figured that I should at least try to treat them decently when at work. They're also quite useful for driving around with the windows down. Conversation is easy, but much less unpleasant wind in ears (the feeling of continuous popping tends to make me very cranky).