hello ,,,am looking at the following detectors gold bug 2 , gold kruzer , minelab 800 or 600 maybe a used tdi .....the place am going nugget hunting is new to me ...i do not know the size of nuggets......over the years a few have been found ..... am going to a small island in south east asia theres old copper and or gold mine in the area .. i think it was placer mine with a few small rivers nearby and lots of iron sand ....need advice on what would be the best detector on this list for the