so if I remember correctly the 2006 is the 4 stroke rotax. I would kill for a wake tower. 4k is a bit of money but I would go with the challenger. the mercury based boats can be hard to find someone to work on them. 10k for a utopia of that year and low hours seems good for Canada. either way, in my mind its close but I would get the rotax strictly due to the convenience of being able to have it worked on. plus a wake tower!!!!