I bought a my first good headphones (grado sr80i) about 6 months ago and I love them. But I need a noise isolating pair of headphones and i was wondering if the akg 550s will sound better than my current headphones. I will be driving them primarily off of my ipod touch. I listen to a little bit of everything but mostly alternative and indie rock; some of my favorite artists are Jack Johnson, Radiohead, The Smiths, and the Electric Light Orchestra. Also I tried the hd 25's and I thought they sounded completely lifeless and terrible if that helps. Thanks!