So as far as I can say Schiit Magni and Modi combo works great with HE-400. I Really do enjoy it.
Over FiiO E11 I got quite less background noise,little more overall clarity, dynamics and bass is bit better in terms I understand - impact and extension.
Change with HE-400 wasn't as dramatic as with HD650 but definitely noticeable.
Some pictures :
Best part : cutting box open
Few hours later
Have to admit that decent role in deciding what amp/dac to pick was look of this combo, it looks really lovely