GPS Navigation

Any recommendations with reasons / comments please.
I have a need for a in vehicle GPS navigation system that must provide voice and visual directions while navigating in towns / cities that are strange to me.
3.5" screen size would be OK, no smaller.
I must be able to acquire GPS from an external antennae as our vehicle has a metal sun visor fitted.
It would be good if updated maps and topographic maps could be updated/ utilised. Intend to go off-road also.
Although I do have a laptop, I would prefer not to use it for visual reference while driving if I can avoid it. I can handle emails OK but am certainly not a computer literate person.
What experiences are there out there, recommendations, rough costs etc...
Was in BigW yesterday and they have a Binatone brand. Any experience with this one?.
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