I've seen the etymotics recommended for excellent isolation: 32 to 42 dBA noise reduction. However, they seem not to get the best reviews for their sound quality.
I use my philips she's from time to time now, but my guess is that they only offer, say, 12 to 15 dBA noise reduction.
IEM's like these seem like a terrific value:
But I'm sure you guys have lots or at least several recommendations on IEM's with comparable noise isolation yet with better SQ?
I have a preference for a V sound signature but not to any extreme degree.