For me it's just been BL-03 > ER2SE so far. There have been a few tws purchases here and there, but I consider those separate from my wired sets. Thinking of grabbing the S12 as my next (and possibly last) wired set. I don't feel comfortable spending more than $200 on IEMs, and from what I hear the S12 is competitive with stuff in the $500-700 range for detail, so I think I'd be cool with stopping there.