Raymarine c vs.e series

[admiralslater]

I am about to replace my existing. Chart plotter with new Raymarine, either the C or E series. I know that the main difference is the hybrid touch. Are there any other important factors to consider.. i.e. performance issues or becoming outdated quickly. I was told by a retailer that the C series will stay current as the US coast guard will not allow touch screens in certain scenarios ,I am not sure if this is true. I will not have a radar, and will be sailing in a the Caribbean. It is compatible with the other gear on the boat.
I ask because the price difference is substantial, and I could live with out the touchscreen. What electronic charts do people like considering my location
David