Difficult choice isn't it. I went for the SH CP300i because it has more of everything compared to the CP180 and was dragged towards SH because its the compatibility with the 1500E version of their
radio - which got some best-buy reviews. I wanted an AIS interface too, as well as more outputs for NMEA for
radar, Yeoman, etc.. The local
C-MAP charts were packaged half price with it too. It was a bit of a tug, because I had preferred
Garmin from previous good experience.