Yes that would be interesting to know. The P-200 does not have balanced inputs as far as I can tell from pre production unit pics. Not sure what balanced would do for you in as there are no balanced outs for balanced cans. My "reference" big rig with speakers is balanced all the way to the power amp. Doubt I would be able to tell the difference if I changed it all back to SE. Too much trouble to find out.
I sent OAHN an email regarding the P-1 and the P-200. Philip said:
"While the P-1 was recently discontinued, as Luxman were unable to source the parts to continue manufacturing. We are expecting deliveries later next month on a more inexpensive model the P-200, which is also a Class A design and delivery 80- 85% of the performance of the P-1 at about 60% of the cost."
Audio Cubes II still shows the P-1 as being available. (?)