This is definitely going on the Changstar loaner program.
A comparison with HE400i would be great since its closer in price than 560
I would suggest forget about 400i and go for either 400S or 560. 400S has far better price/performance ratio while 560 has far better technicality. Price ain't an indicator of nothing.
I don't think HE400S competes with HE560. Sure FR is a little bit different (and I can see people preferring the HE400S response) but HE560 is more resolving and faster sounding. The Bill-p and Jerg modded HE560s were pretty fantastic
Slightly of topic but how would you compare a properly driven hd6X0 to the modded he560? Reports of the the jerg560 sounding like a baby code-x with most of the detail of a hd800 got me curious but at $800 its only $100 away from a used hd800. I like the paradox sound including the subbass but lack of dynamics and my new found mission to get a tube amp for tube clarity and tube bloom have got me questioning gettinng another ortho
HE6 driver is clearly superior to 560 in resolution and it's still waaay behind the HD800. The idea of the 560 being close is from people who haven't heard and HD800 properly. Their gear is probably mediocre. Yes, I know that's a typical line that gets eyes rolling. Unfortunately it's usually true wrt HD800 impressions.