in my experience there are 2 routes : the one i took and the one that i think i should have taken..
the one i took :- shure se 535 (preferably ltd-j if you are in asia) for all around sound especially the mids.. gives the whole picture but not an expert in either bass or treble...very suitable for ipod listening with its high sensitivity.
the dba-02/brainwavz b2/gh-erc-dms for some of the better performers with great value, treble oriented with some excellent imaging... not far off from top-tier iems
one i should have taken :
re-272 for critical listening..
mdr ex-1000 all rounder