Good sound quality is very subjective. Some like their music dark and muddy, and there are artists who produce that way on purpose. It all comes down to taste.
I personally am not a Shpongle worshiper, but I can appreciate them for sure. You will find a large number of people who would disagree with you that Shpongle has poor sound quality.
As for really crisp clear sound quality, newer progressive and/or minimal, and some full on releases have "good" sound quality in that way. Sound quality in that way does not always equal inspiring music however...