Probably RE-400 or UM1. These are more balanced sound than Se215. Tried all 3, the one I like most is Westone UM1.
For, Hifiman RE-400, it is a tiny IEM, a bit too small for me. Good sound stage with balanced/accurate sound. Some says it's a flat/neutral headphone, some say it's a warm and sweet.
For UM1, this is the one I choose after tried all 3 IEMs. This one sounds warmer and smoother compared to others. Less punchy bass which I prefer. Good for vocal/classical type music.