I just use an iPod touch and Walkman for my music. I listen several hours a day primarily just at home but in the car also. It's almost all music. Enough so that is the only worthwhile thing to mention.
320$ is my "Oh my god, I have NO money left these better be worth it" price. If spending that much will get me a superior product I will spend it but I will feel every single dime.
My decision to go for around the ear rather than on or in is based upon the possibly wrong idea that that will give both me and everyone around me a quieter experience. When I have headphones on I want the world to drop away.
My preferred genres are hard rock, movie score style stuff(all the orchestral epic sort of thing), and symphonic metal. That really is just about the breadth of my taste. But at 280$ I have a hard time believing their is a genre that won't sound amazing.
I think that about covers it. If you need any more info just ask and I will try to get it for you. And if this is on the wrong area, I am sincerely sorry. I can only assume there are moderators that will spare a newbie and move this to the appropriate area. Excuse the possible spelling errors to... iPod plus sleep deprivation.