Hey Ken, regarding your Koss experimentations: the answer seems simple, get the PortaPro. Version of the same driver as the KSC and UR40, very similar to KSC-75 sound, but with more bass, largely the result of the headband pushing the drivers a little closer to the ear. Should be exactly what you're looking for. And they're cheap, so you can grab them and start saving up for your equations or beyers. And even when you do upgrade, it's always good to have a PortaPro sitting around.