You know I've got some of the kit you list Trev but I was lazy and had a marine electrician fit it,you'll need it all networked and if you run 2 screens on the Gen2 get one with chart plotter and fish finder the other can be just a plotter as they share info/functions.This then really does away with a fluxgate compass as radar overlay is overrated IMHO,so chart on one screen plus sounder and radar on the other,there you go just saved you£1500
I'm on boat tomorrow PM come on down if possible and have a play
Nigel