I have had both the C series and the E series.
They both are excellent and when you have the correct chart in either they will provide excellent color detail of the lake.
The E series offers the ability to have a 3-D display of the lake as well as a video display for a camera system. They both will handle Radar (which I have) and the radar can be overlayed right over the chart.
I would say unless you really need the 3-d or video feature go with the c series.
Shop around, I found a C120 unit on E-bay slighty used for about one third of the original cost.
Good luck.
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