i'm thinking of getting a high 200, low 300 dollar pair of headphones. look at the AKG k701/702, beyer dt880's etc... but what i'm wondering is what do i need as far as headphone amps go? how much should i spend on one to get the full effect? also do i need a DAC? i don't really get what these...

i was looking to buy a portable pair of headphones mainly for going to school and such, and i also want them to be noise cancelling. what would be a good pair to get?   right now i'm looking at the sennheiser hd 25-1's. these look good, as i have heard they are both portable and noise...

i need a solid amp for my shure srh 840's i'm gonna be ordering soon. i'm gonna use them mainly at school/on the bus, but from what i've read they are much better with an amp. are there amps that i could say, carry in my pocket, while i'm out and about? i would really appreciate some knowledge...

i want to buy some good headphones for my ipod touch. i listen to rock/metal, and also techno/trance/electronica. i'm thinking about either the shure srh440/srh840. i'm mostly gonna use them at school/on the bus and stuff. i really don't know anything about amps, so i don't feel...

im currently looking for over the ear headphones, closed back is also required. i plan on listening to music on my ipod directly, and i generally speaking listen to music on the go/at school. currently i'm thinking the akg k271, because they are closed back and a good price, and from what...