Cool, I’m happy seeing so many people here like the HE400i and I too started with HFM and the HE400i.
Gawd, the HE400i, that takes me back all the way to before I even had my THX amp and was using a Sound Blaster X G6. I remember being so impressed with the HE400i on the G6 that I decided to go audiophile with the THX amp. Glad I did both.
I remember really liking the mids on the HE400i and was wondering if others here like the mids on the HE400i too? I remember the HE400i mids really made voices pop and Youtube videos really sound like I was in the room with the person talking, like Zeos. Really good acoustics. I remember not liking the HE400i cable and purchased the Newfonics(?) cable (non SPC) and liking it better than the stock cable. I don’t think I ever tried a SPC cable on the HE400i and I would be interested in hearing if others here have. I remember the HE400i having a smooth and non-harsh top end that did not extend, at least with the cables I had, and the bass was good, but did not extend either, again at least with the cables I was using.
All in all, I really like the HE400i and think it’s a huge bargain at around $179.00 and I feel it really has its place for making voices pop and Youtube acoustics sound like I’m there in the room.
The reason for my previous post was not to compare the HE400i to the Ananda, as this would be silly, but to offer my opinion and say I would not use the Ananda, or the Sundara, for Rock or Metal as my opinion is that a bigger mid and lower top end would be better. Also, the OP asked a question on two headphones in different price ranges, sub $500 and over $500, so I offered an alternative for each category.
Also, I believe in burn-in and feel the HE400i got bigger sounding with break-in. Bigger bass, bigger mids, and smoother top end.
Just my opinion and YMMV.