What I am looking for are some closed headphones, preferably passive noise isolation. They must also be able to be easily driven on a mp3 player such as the iPod Touch 4th gen or the Touch HD, I don't want to carry a amp around so headphones which really need that are not an option. I listen to Dubstep/DnB/Rock and basically any electronic music. I prefer a warm sound which my Sennheiser HD 555's give me. Preferably I would like to not have Sennheiser this time as I already own the HD 555's/CX400-II and some others from them. They need to be around the ear's and I want them to be comfortable. They will be used whilst traveling so being able to fold them would a plus but not needed.
I have been looking at the Shure SRH-440 and SRH-840 but apparently they have a low amount of bass and there are mixed reports about the amping of them. The Audio-Technica ATH-M50 are also not really an option, I really love them but a friend already has them which makes me prefer not to have them otherwise I feel like copying. The AKG 272 MK II apparently also have a low amount of bass.
Thanks for any help, and be sure to ask any questions you have.