Try the final audio e5000. It's got solid bass, good build quality, replaceable cable, strong isolation with foam tips. It's a bit light on treble, but if you eq down the bass a bit it sounds pretty balanced.
Not sure how the customer service is though as they are based in Japan, also its decently microphonic when worn cable down without a shirt clip.
E5000 isolation isn't great, customer service is though as we are their UK distributor
Have you looked into some of the Westone models, like the UM Pro20, or the W30?