Without mapping that is pricey in my opinion! For a second hand unit add mapping at R2500 (as per SnR.) and you could rather get a new Eagle Fishelite 640 unit. It's not a Furuno, but it will have the same screen, better resolution, a guarantee, mapping and a more powerful sounder (1500w instead of 600w).
List price on that unit is R8k before discount.
As far as I'm concerned they are basically Lowranse units just not as high specked... Lower resolution than equivilant unit etc.
My 2c.
Edit: was reading the wrong pricing! FishElite 640c 5" C 640x480 1,500w R 10,100.00