As usual, @tomic601 , gives sound advice, and +1 on joining the Vandy forum.
My 2 cents-
1.Get the new Vandy Preamp and be done with it.(I think it is all SS, but don't quote me).
2. Find an Ayre KXR (preferrably Twenty, but the non-Twenty is might good).Though I don't know how it interacts with the Rogue, as I have the matching MXR's.
I own both the KXR (non -Twenty) and the Atmasphere MP-1 (essentially stock), and, to be honest, they are pretty darned close in sound reproduction. So, if you are intent on tubes, that might be another option. But, to my ears, the Arye seems a bit 'tighter' than the Atma.
YMMV
Bob