I dipped my toe in the water of chi-fi budget earphones a few days ago, with a pair of KZ ATE's. I think they're pretty amazing for the price, but they're not quite ideal and I'm looking for some guidance on what to go for to improve on these (I note that nobody on this thread talks about the KZ ATE's any more, so I presume they have been effectively superseded). I listen more to classical music than anything else, and where I'm looking for the biggest improvements is in full orchestral sound. What I'm looking for particularly is tonal accuracy (so strings sound right, for example); a lack of shrillness or congestion when the full orchestra is playing; and spaciousness, airiness, so I get a feel of the concert hall, and what I presume people refer to as soundstage, an ability to 'see' the orchestra laid out in front of me.
I will be mainly using my LG G5 smartphone as a source, either standalone or with the B&O Hi-Fi DAC which can be fitted (which is built from a Sabre ES9028C2M digital to analogue converter and a Sabre 9602c headphone amplifier).
I'm hoping there's some dirt-cheap Chinese IEMs out there which will nicely fit the bill. From reviews elsewhere and from combing through this thread, I'm leaning towards maybe the Tin Audio T2, AudioSense T180, Blon BL-03 or Semkarch CNT1. Don't know how well any of these would match my requirements. Any recommendations would be most welcome, or indeed general guidance as to what qualities I should be looking for. (Oh, and because they were $6 or so, I've already ordered a pair of Sony MH755s to try out).