Boat equipment question

I searched the internet and spoke with numerous wareagle boat owners. I,ve decided on the wareagle 861 predator. Spoke with the closest dealer and will going to see one in his show room Tuesday. My next question for input, has to do with fish finders. I,ve researched on line and looked at Hummingbird 788SI combo for up front and a Hummingbird 998SI combo for the driver side. Also looking at Lowrance HDS 5 gen 2 with structure scan for up front and Lowrance HDS 10 gen 2 with SI, DI and structure scan for drivers side. Anyone on here own or had any experience with any of these units. Pros or cons with either. With the price of this stuff, this will definitely be my last boat where it turns out good or bad. Still have all my fishing tackle, so there will be little cost there.