Great thanks everyone.  AZ looks like it would come out at $2800 and CA would be $3625.  It would sit in CA for 95% of the time so for the extra $800 I am better off to register/plate it in CA.   I am still saving a ton vs. buying up here.   $69K CAD vs $87K CAD.  Unless I am missing something but I would imagine the registration fees etc would be fairly minimal?
Good point about insurance - it would be plated CA so would they insure it?  Here in BC it is provincial insurance so it comes with the plates.  How does that work in CA?