Thanks for the great suggestions everyone (and offer Alex). Didn't know about the MH40 and forgot about the 7520 (which I've heard once briefly at CAS - with HAP-S1 - and liked). Would be curious of your experiences with the B&Ws Jacob. Michael I think your and my ears are pretty similar on the HD580/ER4S front, but I seem the one of the few that doesn't love the K550s. Its boxy/reflective sound gets to me (rather deal with the flat staging of the HD25-1 II). In fact I forgot I had a pair as I packed them away after a couple weeks. Giving them another shot and have them on my head now. Will give more thoughts to NAD, Sonys and new models too like the PM-3 and maybe even EL-8 closed, though I guess I now need to consider occasional thieves walking past again. And for the associates - for the foreseeable future likely using using a GO720, though I could switch to something better (DLIII + DSHA-1, Pulse Xfi + LPS, etc.?) if I'm not too lazy to pack away a larger rig each night.