[Sans Peur]

Right now Garmin and Simrad are the leaders in marine electronics. I replaced everything on my boat with Garmin. I was used to their operating systems and already had the blue charts. I was able to use my old transducer with the garmin because they have a splice box. I cut off the end of the cable, attached the wires to the terminals inside and hooked it into the system. Works perfect.

I don't think you are going to get a plotter and radar for $3k unless you find a deal on some used equipment.