Sounds like a phenomenal deal. ^
We have done several repo cruises, all in the South Atlantic, where the water tends to be quite calm. The cruises have normally left from the Balearic Islands to Virgin Islands, with one stop in either St. Barths or Antigua. All of the cruises were on The Sea Goddess (now Sea Dream).
We loved those cruises. Never saw anyone get seasick. Just a great time to kick back and relax and read all of those books you've been meaning to get to.