I sold my BHA-1 a few months ago, anticipating imminent GS-X shipment. I don't think one will be there, sorry. For what it's worth, I thought the BHA-1's slightly bright nature would help correct the LCD-2's darkness, but it didn't help so I returned the LCD-2 as I couldn't listen to them anymore. From all reports, the LCD-X is somewhat better, but still dark-ish.
As far as tunes, most people these days have laptops and tablets, so memory stick for ultrabooks, cd or memory stick for laptops, cd for cd players (a few still show up), and there will probably be a few turntables if you have vinyl to spin. You are more or less stuck with what is on a tablet, but most people tend to have similar stuff, so usually you can find something you are familiar with. If you have to listen to something you brought on a tablet based rig, ask the owner and maybe they can get you setup somehow.