I am looking to buy headphones for listening to music on my phone with. I only want to spend up to £30 ($50). I want them to be foldable and ideally with a carry case so that I can put them in my bag during school. I also want them to be fairly isolating, so that noises around me don't affect my music. I listen to Liquid DnB and melodic dubstep, so deep bass is a priority. I do not know much about headphones, I have only ever owned Turtle Beaches so I don't really know what to expect. For portability at this price most people seem to recommend the Sennheiser PX 100-II or the Koss Porta Pro, but these seem to be lacking in isolation so I probably do not want these. Currently I am looking at the Denon AH-P372 (£25). Is this a good choice? What would be better?
Thanks in advance!