I am not sure how many people know this, but since tomorrow is the last day, for people who want to buy HD558, this is a great chance to just spend few more and get HD598. http://www.frys.com/product/7821729   If this isn't allowed please delete the thread. just I spent so much time to compare...

Any ideas which Jack I can use?   For some reason my computer only recognize USB things, I tried one 3.5mm earphone does not work(shows audio info changed but no speaker pop up), but when I plug in USB one it works(I just set the headphone to default).      Any suggestions?

I know nothing about headphones but I am pretty tired of the quality of my $9.99 speakerphone. I have $150.00 budget, and search on the web seems Sennheiser HD380 is a good choice, now $140.00 at amazon. However I see other brands like Grado 80i, Axxxxx-M50? and something else but due to...