Possible speaker change

I currently have the SF Liuto towers w/ matching Smart center. Haven't decided on surrounds or a sub. They are powered by a Mac MC205 using a Marantz AV7005. I'm thinking possibly going w/ the SF Cremona Auditors or Olympica I, using the Cremona center. I mainly will use for movies, but possibly going 2 channel down the road. Long as the Mac has enough juice to power the new speakers I'll consider, if not, I'll stick with the current set up. Thoughts of changing?