Hello guys. I purchased a Superfi 5vi used, not so long ago (about a month) and I'm enjoying these IEMs very much. The isolation is pretty good (using silicon tips, better using foam tips) and so is the sound quality. However, I'm looking for some advice in upgrading to other IEM's. I'm mostly looking for better isolation, if possible. Any improvement in sound quality is appreciated. My price range would be something around U$200. Having a microphone and a button to play/pause or skip tracks isn't mandatory. Thanks for reading, any comment is welcome.