I have a pair of Etymotics musicians' earplugs - they were customed fitted to my ears in an audiologist's office after a complete aural evaluation. They took a wax mold of both my ears which they sent to the factory to manufacture my earplugs. I know that Etymotics and a few other companies make custom-fit earbuds as well. If the earbuds fit like my earplugs, which I imagine they would, then I recommend them 100%.
Earbuds are a fine balance of audio quality and fit. I've had GREAT sounding earbuds that hurt my ears like crazy, and well-fitting earbuds that sounded like crap. Etymotics is a reputable audio company, so I'm sure their earbuds don't sound like crap. Go custom fit, that's my