I have 2 Popcorn Hour network media tanks (an A400 and an A500) with pretty much a complete collection of 3D videos on a 2tb hard drive. I would like to trade either one for something audio related of equal value (headphones, dap, dac?). The difference in the two is that the A500 does 4K and has an upgraded Sabre dac. The A400 is limited to 1080. The videos are 1080 as well. Interested?