I’ve searched the threads and think I’m more confused now than ever. I’m looking for a good thru hull for the 1971 that won’t cost me more than the unit. Is $400 reasonable? Mostly inshore sea bass, fluke, wreck fishing with some offshore tuna trolling. Don’t need to see the bottom at 1000’. Would like to have good definition and use the capability of the machine. Looks like they are something like 30 options listed on the products page. Any help narrowing it down would be much appreciated.