The bundled earphones provide excellent audio quality but are a bit harsh on your ears. If you listen to loud music through them, your ears will be permanently damaged. There have been many such cases.
Anyway, you could look at Sony's Fontopia range within a budget of Rs. 5,000. If you want something better and have the dough, look for products from Bose.
Sorry if I wasn't much help but I am not too educated when it comes to hardware.