G23 450 vs 550

I posted a while back about my under-powered 2008 MCX 350 x-star. At the time I considered buying a similar star with a larger engine, however I received mixed feedback on weather the 6.0 L engine was a worthwhile improvement, and several people warned me that the larger 8.1 L engine was mechanically problematic. Thanks to all who gave me their input on that. If I were to take a new direction and go for a used G23, will the 450 get on plane with ballast full and boat loaded in a reasonable amount of time? Will I wish I had the 550 down the road like I wish my xstar had a bigger engine now? Thanks again.