I have owned or currently own three of the IEM's that you listed. The CKS77's, monster turbines, and the soul sl99's.
I've owned two pairs of monster turbines (both of which ended up with huge microphonics issues)...They sounded pretty good while they were functioning properly, but they crapped out rather quickly. Additionally the cable on them is garbage (although the one one the cks77's isn't much better).
I preferred the SL99's to the turbines (they had slightly better bass response), but they left me wanting more...
I'm currently using the Audio Technica CKS77's as my portable IEM. They have pretty good bass response just plugged into my laptop or my Google Nexus 4. They absolutely POUND when hooked up to my FiiO E17. The bass is very tight and there isn't a hint of distortion.
a previous poster mentioned the new Denon AH-C300's....I'm very tempted to compare to my Audio Technica's
Edited by Jonbbas - 11/27/12 at 5:42pm