The Super One 100ohm bio driver for the M2s Pro are my favorite (to my ears). Since the M4 came out, all of those have been discontinued, so if you can get a set (and are ever planning on owning them) now might be the only time to get them.... Just a heads up..the 100ohm driver seems intriguing to me, I do like a more balanced sound sig.
right now I am waiting on my trn ema to arrive (heard it was a pretty good stupid cheap earbud so I went ahead and got one) and am messing around with a tingo tc200 diy, and a hifiman he400se as well that I just got. so some more buds will have to wait.
I have always been curious about the Hifiman HE400SE (owning the HE400S), but I have not been able to hear from anyone that has had both to compare. The HE400S has always been more akin to the HE400I (OG), but I have never been sure where the HE400SE fits (being much cheaper than both of those). And we know how terrible Hifiman is at naming their phones. Most times the naming only suggests they are in the same family, but in reality, they never are.