..sorry for not getting back earlier, lack of leisure!
Kamil: I cannot judge yet usb vs. cd/sacd, this is mostly due to the fact that my usb material is my own music, so naturally i always consider it "better" than from disc, but objectively, I cannot vouch for it. To be honest, I am much slower with detecting differences that matter than other people.
Still, I consider the Wadia as outstanding (congrats MSW1), and I could imagine, that with the GNS mods you can reduce the difference of 7 to 5 to 381 considerably. For my sake i wish, not too much.