I stumbled upon your review while doing some more research on the NFB-7. Great review!
I actually don't want to wait much longer so I'll probably make a purchase within the next week or two. I had listened to the Lyr and wasn't all that impressed with it. Tubes just aren't for me. And the chips they will use is another big question. I've heard the HE-6 on another persons Roc before (had a Ref One too) and it drove the HE-6 ok. I would say it was only a little better than my setup as the time since I felt the Roc didn't quite have enough power. If it were a ROC SA, that would have totally destroyed my setup. Believe me, that extra power matters a lot for the HE-6. And this is coming from a guy who feels that source is more important than the amp (assuming enough power is provided). Have you considered getting the EF6 when it comes out? I believe it will be ~900 USD. The Master-6 would probably be much better except it cost 700 more when you include shipping to the cost.