I also would like to move from klipsch S4i and hesitate between these following IEM:
Westone W3 /W30
Westone UM30PRO /UM3X
I can get any of them for almost same price
I listen to many style of music, pop, rock, latin, classical, dance, and my S4i give me quite good service
i just think they lack of medium and have a bit of sibilance.
what i expect is a WOW, with very good separation and clarity with nice bass even if its less than my S4i.
i like Westone but i can consider other brands, i saw some nice comments about Audio Technica CK100PRO
beside the fact that some peoples seems to complain that they unable to go too loud.
Thank you for your suggestions.