I definitely would not recommend the C551, at all. My friend has a pair, and IMO, they have no soundstage to speak of, and the bass reminds me of my really bad Sony clip-ons.
The RE2 isolates very well with the included biflanges. The bass is nice and tight, though might need some EQing for a few people. I haven't tried them with Comply tips, though.
I can't comment on the CK7, because I haven't tried them.
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"To me, records were no longer just about the songs anymore, but about the sound. Headphones opened up a world of sonic colors, a palette of nuances and details that went far beyond the chords and melody, the lyrics, or a particular singer's voice."
This Is Your Brain On Music: The Science of a Human Obsession by Daniel J. Levitin
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