The best earplugs, in my opinion are Muscians Earplugs. I've got a pair and I can't go to a club without them. They are somewhat expensive but they'll give you a tax receipt so you can write them off. You're able to get them in two ways, 15db and 25 db, meaning that the music is lowered 15/25db when you have them in.
They are incredible. You go to the office and they squirt some stuff in your ear, wait 2-5 minutes or however long it takes to harden and then you come back in a week. What you get is a pair of customised earplugs that only YOU can wear. If you dj, you can use them while you play, if you talk on the radio in a club, you can use them as well, just put the headphones on like you usually would.
They take a little getting used to but they make a 100% difference when you're at a club. You don't even have to take them out when you talk to someone, you can hear everything perfect just 15db or whatever - lower.
Need the number? Email or PM me, I'll give it to you. If you go to clubs, you really should get a pair, your ears will never ring again.
vench