Question Headphones for Astell & Kern SR25

[That Guy]

Previously I was using AK Junior with Shure SE425. I've upgraded to AK SR25 so that music management would be simpler with spotify and I thought maybe it's a good time to upgrade my headphones as well.
I was trying to find information of what source-to-headphones budget ratio is recommended for portable setup, but I have not found good info on it.
I would be thankful for any suggestions for the budget ratio or for particular sound isolating in-ear headphones. I prefer wired but that's optional.
I don't have strict requirements for sound signature except that I really don't like when there's an exaggerated upper bass, without the lower bass to match it.


P. S.
I was thinking Shure Aonic 5 maybe..

 

[Al ears]

You are using the SR25 to listen to Spotify?
please clarify, do you not have higher res tracks downloaded into a micro SD?
if not headphone quality doesn't really matter much.
I also use a Norma SR25 and use earphones that cost as much as it does.
for a similar budget look at Orivetti OH500

 

[That Guy]

You are using the SR25 to listen to Spotify?
please clarify, do you not have higher res tracks downloaded into a micro SD?
if not headphone quality doesn't really matter much.
I also use a Norma SR25 and use earphones that cost as much as it does.
for a similar budget look at Orivetti OH500

Thanks for the input. I have some flacs on SD as well, I'll probably move to Tidal soon.