New powerhead seems it would be a plus to me. As long as the issue that CAUSED the first powerhead to fail was resolved. 203Champion in good to excellent condition will cost more(for Champion fans) because properly maintained & kept Champions retain a good resale value. NADA is ONLY a guide. It lumps ALL brands together as far as values. NADA doesn't allow for "quality" built differences in brands.
My personal opinion is $12-15,000. Thats with tandem trailer, surge brakes, bunks & tires , paint, etc in good to excellent condition & my guess only
92' ChampioN 201DCR Elite