To get the dialogue started, I'll say that I have the Ety ER6i's and the Shure E3C's, of the ones on your list. I find that the Ety's take a variety of tips, including my current favorite, the short Comply foamies (yes, a modest extra expense, but we're talking secure fit, excellent comfort, clear -- if bright -- sound and excellent isolation ... for me, foamies transformed the Etys from fiddly to very well liked). The ER6i's also are supposed to take the very popular Shure black foamies, which don't need to be replaced as often. I found the Ety bi-flanges to isolate perhaps the best, but the sound depends on the fit, and the seal would shift occasionally on me ... with the foamies, the Etys stay put (which is what I want in in-ears). The tri-flanges aren't as diabolical as they look ... I just don't like them. YMMV.
I'm not thrilled with the sound of the Shures with players on flat settings (iPods), but they do isolate about as well as the Etys. They seem sturdy, but just check out the recent threads on Shure cables ... as has been said before, Shure is better regarded at higher (more expensive) levels than the E3 series.
Phones (in order of purchase):
Sony MDR71, Sony MDR51, Etymotic ER6, Panasonic RP-HJ50, Shure E3C, Koss PortaPro 2, Creative EP630, Etymotic ER6i, Sennheiser PX-100, Sennheiser HD555, Future Sonics Atrio M5