Please check out this post by Master Slater on the history behind why some bands are banned for discussion on Headfi:
https://www.head-fi.org/threads/kno...essions-thread.698148/page-1978#post-14135342
Under $50 USD, 2 of the more technical sets are the HZSound Heart Mirror and the Tanchjim OLA.
The former is neutral bright, small soundstage but very good imaging, instrument separation, clarity and micro-detailing. May be a bit bright for treblesensitive folk though.
The latter is tuned to the HRTF curve, which boosts the 2kHz to 5 kHz regions. However, this curve does not boost a single frequency, but rather, affects a broader range. The OLA is very technical too, cold and sterile, but the elephant in the room in the awful fit. It has too short nozzles and a round shell, most folk need to spend a bit more to secure aftermarket eartips to get a proper fit.