I'm a big fan of Skull Screws. I've been using them for about 7 years now in multiple bands and projects, some louder than others. 25 NRR, comfortable, and I can still hear what's going on. I was at an ENT about 2 months ago and my hearing was about that of a 16 year old (I'm 25). They're on Amazon per pair or you can get them in bulk for $50 (120 pairs).