I am looking for a new fish finder and plotter. I am looking to stay around the $1k mark (less if there's something comparable but cheaper). I am more interested in the fish finding capabilities than the chart plotting capabilities. I will be using the unit 95% of the time in Kachemak bay. I mainly troll for salmon, bait fish and jig halibut and rockfish. Which of the units above do you have experience with and recommend? Am I missing any good units? Are these units overkill for my mission? Can you "see" halibut on the bottom with these units? Thanks!