To be honest to you, Sennheiser does not make good low-end headphone. They are better off audiophile headphone not consumer. Therefore, CX300 & 400 are definately out of your list
Where as JVC makes good consumer freindly product! XD JVC HA-FX1X has strong build quality with extreme bass & treble. Between these two is/are the mids that is recessed.
As for Philips side, SHE3580 and cut out the others Philips you had listed :) Check out the review here http://www.head-fi.org/t/561951/philips-she3580-iem-review-how-can-something-sound-so-good-for-10 I like this guy review XD
Now would be SHE3580 VS JVC HA-FX1X eh? lol :D
can't find philips 3580 i think i'll go for 3590 vs sony ex10lp vs jvc vs the others
do you have a specific model in mind ? i prefer normal shape iems, don't like when something's around my ear, so classic style ex10lp is better
Okay,so if you want a natural sounding and has a good punchy bass,I will definitely recommnding you the Yamaha Hph200,it has a nice sound,review can be found here : http://earmass.com/2012/11/25/yamaha-hph-200-not-about-piano-this-time/
already took vmoda m80, but thank you anyway :)