I would go with the Helix 12 G2N for $1,800.00. I have the 9 Mega and my problem is now my screen isn't large enough to use mapping, SI, DI and 2D all on the same screen. So now I'm looking for a 7" unit just to use for the map. I'm very pleased with the clarity of the G2N Mega, not sure 20% more clarity would make much difference at all.