Have been looking at HD560S and he400se for sometime (among a score of others). The confusion arises since 560S doesnt need an amp while he400se requires one. That adds convenience and changes the price equation.To my audiophile friends here, who have good IEMs, headphones, but no amp. Buy a cheap one like NX1S ( available with HPZ) over the expensive dongle DACs. Most of us need some more power from the onboard amp of the phone, all new phones from last 3/4 years have very decent ( clean ) headphone out/ usb line out, all they need is a little more power to drive. And these dongles are pretty expensive for what they do ( few exceptions like E1DA, S9 pro...some hardcore audiophiles I trust swear by them)
If you're after something different AKG K702 is a good option, if the bass is not enough, get the K712. HD560s is also a solid option, but some may find it boring.
Any idea how they compare if the he400se runs on k5 pro or a topping L30.