Suggest me an IEM within 5k

Please suggest me a good IEM within 5k,currently using Sony MDR EX 57,which is okay at best,need something better.I am not really a bass head,but a clear bass is required.Thought of fiio e5 and pl 50 combo,but pl 50 has low impedence and it`s sensitivity is on the higher side to be used with an amp.Thinking of klipsch s4 or metro fi220.Please pour in your suggestions.
P.S the source will be cowon v5(mostly) and ipod touch.