If I were using full size most of the time, I am probably not going to bother with output impedance that much. But given I am pretty dedicated IEM user and how popular IEM has became, I just thought that will be an useful information for consideration... Anyway, where can I get a sponsorship from Amazon?
About my amp consideration, I do use my Etymotic IEMs, and I figured if an amp supplies enough current for a low Ohm headphone it should do well for a 62 Ohm full size. I might've just stuck with my E5 to be honest, except my E5 has it's bass boost stuck on, the amp has to almost max it's power output to get to a normal listening volume, and of course new stuff is cool.