I wwould recommend the Garmin. I have a 12" screen that does all you ask. The processor is slow but it has good mapping and a very good sonar with the thru hull ducer. I added a small radar unit that works great for what I need with a nice overlay system. I would also recommend a fusion stereo if you like that stuff,mine takes an iphone/ipod inside of the unit for a personal touch and is also satellite ready which interfaces with the Garmin for sirius weather. I also have it wired into the icom for distress purposes.
They have some real cutting edge stuff out there for sonar but if your primary use is inshore I wouldn't get too crazy.
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