No phone below 20K will give you the desired audio quality you are looking for. If possible pick up a LG G6, these are going for quite a discounted rate now, should be able to find one around 26k.
Make sure to get the Indian/Asian version and not the US imported ones, the Asian and Indian version has the much loved Quad DAC, I used one and I loved the sound they produced. A very capable phone with great camera and even greater audio capabilities.