+1 for R1 Zenith. I have original R1, which is a 13mm beryllium DD. I believe Zenith is 14mm. Plus a piezo ceramic twitter in addition to a DD. They are 32 ohm, can take a beating without distortion. Nozzles can be swapped to customize audio. Port on the back of the IEM can be opened or closed. Another thing about these, its one the widest soundstage IEM out there.
Another very cool IEM out there is Periodic Audio Carbon ( C ). Single 10mm DD with 8 micron lab diamond diaphragm. This thing is fast, has detail and got some serious bass, no bloat. Can be pushed without signs of distortion. 399$ is a fair price. 5 year warranty. It is terminated in 3.5mm jack, cable is not detachable. Similar to CA Atlas, while being 2.5 times cheaper. More people need to try this one, its a very cool IEM.