Will you ever want to mark waypoints on one and have it show on the other? I’m not sure a Helix and an 800 series will network.
Two years ago I picked up a 597ci hd di. At the time I thought, I’ll never network anything why would I spend the money? Fast forward to last week when a 999ci hd si shows up on my doorstep. Now since I can’t share waypoints or map chips I’m contemplating different ideas. Like, gee maybe I should have gotten the network capable out of the gate.
As for chip, I see your from South Dakota. I don’t have personal experience but common wisdom is Lakemaster for your neighborhood.