Well, it's about that time. I'm looking at my audio stuff and thinking "hmm, what should I drop $200 on next?" I was thinking of buying new IEMs (to uprgrade from my S4s) but there are a lot of fine looking portable headphones out there. I am only concerned that portables will not give me the isolation I desire. I like to listen to music quietly. I will soon have the Cowon J3 DAP, I believe that that is powerful enough to drive most portable headphones? I already have a portable amp, but I'd rather not take it with me everywhere. Do portable headphones provide that much of an improved listening experience over IEMs? With portable audio, I think that isolation is very, very important. So am I stuck with IEMs, or can any portables provide reasonable isolation?