Good circuit for single end in to balance out?

Use a modified Bride of Son of zen -- cascoded, with a single current source.

Somewhere in the database, it was opined that "Metalman's circuit" was the way to go. I used it and it works excellent.

The schematic was in one of the Bride of Zen or Bosoz or BZLS threads.

Or use a pumpkin, I don't have direct experience with the pumpkin, but I am sure it would work great.

JJ