I have the Garmin 93sv, great unit. I changed from Humminbird to garmin and am happy with the change. Found the sonar to be clear, and the touchscreen is an added bonus.
Garmin is easy to update, and these units are easy to network as well. Community maps help and the charts that are provided are very detailed. Plus you can chart your own favourite spots as you troll as well.
Im currently looking into a nema2000 network in order to get my gauges on display from the mercury engine. Very cool features.