I bought Etymotics some years ago, because lots of people raved about them. I never use them now. I find them to be far too bass-light for what I listen to*, and I’m just not that impressed by the sound overall. These, at $35, will knock spots off them, and using the triple flange eartips, not only will nobody else hear them, they have -26dB of background noise attenuation. Once burned-in, the bass is very deep indeed, and they handle vocals and other details well. They’re also very comfortable, and sit right inside the ear, so they don’t get knocked easily. You wear them with the cable at the top, wrapping over and around your ear, like pro IEM’S. I’ve got two pairs, they did a holiday, 10% off, BOGOF deal last year, and I wear them a lot, particularly at work using noisy machinery.
You could also go for Shure SE215’s, which are more expensive, at about £75 on Amazon, but they have replaceable cables, unique at that price, and really worth having. Top-notch sound, mine are two years old now, and work just fine. Again, I use triple-flange eartips on mine, for the best seal in the ear canal. Fantastic sound quality, if you want better, you have to go up to Westone, UE or Shure at around £400.
*A whole range of rock, Indy, folk, country, metal, punk…