I think the point was more within the OP's stated budget and conditions - not deciding what is the best headphone overall. Also, shouldn't the Cambridge mentioned earlier be suitable with the HE-6? (I know a few users have enjoyed them with other brands of IAs). I'm honestly asking this - I know the specsheet says 20 mW, but a lot of people tend to want/need a lot more than 20 mW.
woops :s sorry. I was completely wrong in this case. 1st part I was messing a bit (but I guess sarcasm and such doesn't transfer well across the screen). 20mW for the HE-6? I've just searched for it and couldn't find the capacity. Most phones that I've seen are around a watt or 2 in capacity (just what I've seen, but I haven't seen much). HE-6's aren't very efficient, so maybe that's the reason? That's what I've seen at least. You're much more knowledgeable than I am in headphones obobskivich >_< ah, I've for got to say this, but thanks for the help on the rec!