On the high cost (meteoric) of the HE-1, and being a Stax nut, I would spend that in a heartbeat if I had it spare to do so. Sadly I believe most posters on here won't be able to do that, and the ones that do buy the HE-1 are possibly not going to be avid posters on here. Huge assumptions there, but that is what I think at the moment. Almost like a secret club that us underlings know nohing about, or if it even exists.
However, having heard the HE-1, albeit at Can-Jam London for only 15 minutes, I believe you can get close to that sound with the 009 and a top KG amp, fed by a very smooth sounding DAC preferably with tubes in it. Thus in my mind, a take on that level of sound doesn't need to be unreachable, it requires some research and thought, and it isn't a one box solution like the HE-1.
So fear not my friends, we can have some of that cake as well, not just dream about it! Anyway, YMMV and this is my opinion to date. I want to hear it again but next time with my selected tracks, not the stupid non sleeve CDs the Senn staff had to hand.