So my bedroom rig will be a simple Fiio E17 and the Sennheiser HD-595. The Hifiman HE-300 are going to be the main rig for my fiancee'.
I just realized how heavy the HE-400 are by putting the HD-595 on. They seriously felt ... cheap. Like there was nothing on my head. They sound amazing, but as a big guy, I actually like the weight of the HE-400. It's comforting. Weird feeling to go from that to a lighter headphone. Before the HE-400, the HD-595 felt just fine on my head.