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Here are the lines offering repositioning cruises which include a full transit of the Panama Canal:

Holland America / Ryndam, Zuiderdam, Westerdam

Princess / Island Princess

Crystal / Symphony

Windstar / Wind Star

Azamara Club Cruises / Journey

Disney / Wonder

Celebrity / Millenium, Century

Regent / Seven Seas Navigator

Oceania Cruises / Regatta

They vary in length and run anywhere from 15- to 29-days. I think any of them will be a good choice.