Just to make this thread more complete, I've since learned that besides the $1200 Infinicap upgrade NRostov wrote of, the factory will also do the "Super Balanced Input" upgrade for $1200, as well as a "Tube Saver" upgrade for $500.
A question they didn't answer was: Would the "Super Balanced Input" do any good if your were running single ended? (you'd have to consider Albertporter's comments if you wanted to do it anyway - especially at that price)
A question they didn't answer was: Would the "Super Balanced Input" do any good if your were running single ended? (you'd have to consider Albertporter's comments if you wanted to do it anyway - especially at that price)