Which fishfinder? Again!

[YakAttak]

With the tax return coming, I have the boss' permission to upgrade my fishfinder.
After much researches and countless readings on posts on BWE about fishfinders, I'm still left with a couple choices. I've owned 1 or 2 Humminbird lower end units in the past which I use as portable units on my kayaks and rentals on lakes and wasn't quite happy with them. So this time, I'm gonna go with Lowrance. Please share some insights so I can decide which FF I'm gonna go with. I'll be using it on both lakes occasionally trolling for stripers but mostly salt, possibly open water hunting for bigger fish in the hopefully near future (Maybe LJ, or rockfish in Newport)

Which of these should I choose:

-Lowrance Elite-5 HDI (cheapest)

- Lowrance Elite-7 HDI

- Or Lowrance HDS-5 (Nautic Insight or Lake Insight?)

Thank you very much for your time & helps.