I've been looking around for some new headphones since my Plantronics pair is getting pretty ragged out. Has anyone tried out the HD555's or 280PRO's? If so, are they worth the money? I'll be gaming, listening to music, tinkering with FL Studio, and watching movies with them. Also, would I need a sound card in order to take full advantage of them or any other good pair? I'd also be up for any suggestions off of this list, they all seem pretty good.