i'm looking for a decent pair of travel headphones, and i'd like to make a purchase very soon! my brother owned a pair of Etymotic Research ER4S's which i absolutely LOVED, but they cost ~$270 which i am very reluctant to pay. i'm looking for something with a similar 'attachment' to the ear but with a lower price. i am very closely considering the ER6's, but the earbud design never worked for me. they would always fall out and were uncomfortable. anyone have any suggestions? also where to buy for dirt cheapest?! one more: if i do decide to break down and buy the ER4's, which should i go with? the S likely sounds the best, but i will be using these only with a portable CD player and no amp so should i get the P version? (my brother had a travel amp that he used with the S 'phones.) thanks in advance to all!