Big 2+ on the G2N for me. If they offered the ice pack in a G2N form, I would pick it up. However, since it is only the G2 you cannot network it with your dash unit.
I have a Helix 9 SI (gen 1) on the dash, and a Helix 7 DI (G2N) on my bow, I love being able to idle and scan with the side imaging, put waypoints on fishy places, them move up to the trolling motor and have the waypoints on the front unit ready to go.
Also, you can see the side imaging with the G2N, regardless if it was sold as a SI unit, as long as there is a SI ducer in the network.