GPS Combo
I have an Islander with Garmin 4208 8" and fits perfectly in the compartment. It's a little more than $1k but I would spend the extra $. The fishfinder picks up 2 ounce sinkers under the boat and the gps screens are crisp and detailed. Very user friendly software as well.
My only negative is I wish they put a full keypad to improve efficiency of naming waypoints.
Just my thoughts. Good luck