Hmm.. I mean, do you have to have detachable cables? If not the Turbine Pro's are definitely the way to go, or the MDT. Monster offers a lifetime warranty on their NEW products*, so if you go with one of the Turbines or the MDT (has to be from an authorized dealer), you could always send it in for a replacement.
*1 year unlimited warranty, after that, even if you break it yourself, they will replace it for FREE once. But just once. Provided you have a receipt from a Monster dealer.
BE EXTREMELY CAREFUL ABOUT BUYING THE IE8 OR IE80 USED. Over half the ones online are fakes from china. But that's not why I think they suck (I have a legit pair from razordogaudio and I don't really like them).
I'm trying to think of alternatives that have a punchy, controlled bass and detachable cables... Hm. Maybe you can pick up a cIEM cheap off the classifieds here (1.37 euro to 1 dollar) and reshell them?
If they don't have to be IEM's, how about the AT M50 or M50x?