C120 to a125, What Charts?

[pstadt]

We have a 2011 Raymarine C120 that is less than user friendly, especially tucked behind the wheel on our FP Orana. We'd like to upgrade to the a125 and I started to purchase today but was baffled by the chart choices that are pre-loaded (or not). We've been using Navionics and like those, but most of the "a" series plotters I looked at come with either the pre loaded RM Lighthouse Charts or C-Map Lakes and US for about $2500 (or Navionics Gold at about $400 more).
Anyone have any recent experience with the "a" series plotters and if so, what charts did you get? We hope to cruise the east coast of the US and the Caribbean soon.

Thanks,

Pat