I think you're getting good information, but not providing enough to really zero in
on what you might like best.
What are some of your favorite bands, favorite albums.
Or a genre you listen to often.
You "appreciate a solid drum kick".
Those drum kicks eat up plenty of voltage, and your phone
(or pretty much anyone's phone) probably won't be up to the
job. OTOH, it could probably handle violin concertos just fine.
I'm leaning towards the Philips. You can drive them with
a decent amp (not the E6). They'll put out a lot of good sound,
and you'll have your (drum) kicks. No problem.
The AKG 701, 702, and 712 need a lot of power to sound
decent. Otherwise they tend to sound thin with anemic bass.
With good gear they scale well, and have a great soundstage
and plenty of detail. The bass, even on the 712, will never knock
you over - amp or not.
As for those HiFiMan > haven't heard the XX version. I did have
the HE400S for a while and found them to be in the mix in and around
that price range regardless of their vaunted electrostatic drivers.
More important to me was their build quality, which I found wanting.
After years at this hobby, having had some crazy number of headphones
and having heard and handled even more than that, I had a strong sense
that the 400S's would break very shortly. As I didn't like them that much
anyway, I sold them. Also, while their mids were nice, they didn't seem to
do anything else so very well. But HiFiMan may have improved their
build quality; I don't know.
But if I was after an electrostatic headphone at a reasonable price,
I'd buy the OPPO PM3. They are (slightly) more than the HiFiMan.
I recommend that you read the reviews, there are plenty out there.
My personal favorite in this range is the Beyerdynamic DT880 (250 ohm).
Yes, they need an amp. I've owned them for years (not the very same
set) and have always found them to be quite a true and satisfyiing listen
with a wide range of music. Check out the immense thread on them
here on Head-Fi.
Lastly, let us know some of your preferences; albums and other music
that's dear to your heart. You'll get better recommendations that way.
And sorry for the length of this...was hoping to keep it shorter.
Anyway -