The 798 would be a preference, but it sure would be nice to have the ability to view SI on the bow. There are quite a few guys who have that very setup. Maybe we can hear from some of the guys who do have SI units on the bow as to how much they use them.
Sure the Interlink will still be usefull. You may waypoints you want to navigate to or fish on and it would suck if they were on the bow unit only or vice versa.
Good Luck,
Robert