I've been using the Veloce Lithio 2.0 for some time. Although no longer marketed, Vytas still supports it. He did an upgrade for me shortly after I got to Texas a couple years ago, different batteries, some other changes. I never tried it with a standard 6H30, have been using NOS DR Reflecktors- it is pretty stunning. I feel no need to change. It has the midrange magic of the Lamm L2 Reference but more information at the frequency extremes.
I think there are lots of good preamps and line stages out there.