@aparnatichkule, SONY and Sennheiser offerings in that budget are not really upto the audio-quality of cheaper Chinese OEM brands. These are the ones you can take a look at --
SoundMAGIC PL-21 / MP21 (the latter being a microphone equipped version)
buy an ES18 and one of these http://www.ebay.in/itm/170966983735...X:IT&_trksid=p3984.m1497.l2649#ht_4530wt_1142
if you need a mic. I have both the ES18 and the MP21, though the mp21 has deeper bass, but the ES18 is more sensitive, so it plays louder and cleaner, something that makes a lot of difference with anemic outputs most phones have. With my atrix 2, it sounds fabulous!