I'm needing to put new electronics on my boat this year, the ones that were on there when I bought it never have worked right and are extremely outdated. Thinking about something like a 998 si/di/gps combo? at the console and then looking to put something up by the TM as well, but not sure what to put? Is it more beneficial to put a SI unit up front as well or is a DI/2d combo all I need up front? Obviously there's quite a bit of pricing difference in these units and I don't want to spend more money on the electronics than necessary. The only way I ever fish is finding structure then casting to it, I'm just new to the electronics part and not sure where to start.

