Single ended RCA preamp short list

Typically preamps w/ both balanced and unbalanced in/out connections sound better in balanced mode.

What are the top single ended (unbalanced) preamps?
I have listened to many preamps with single ended and balanced outs and prefer the single ended every time. A great single ended pre is the Shindo line of preamps
Agree with Shindo and Herron, CAT's, VAC's and older Hovland's are also great SE performers.