I'm in the market for a new metal detector and the two that interest me are the F75 and the Etrac. I know this really isn't the place for this question but I felt I would get more opinions here. The only thing I'm really looking to get out of this machine will be silver coins,mainly 6" up to 11' or 12" deep. I will be hunting mainly in old parks and schools which will have quite a bit of trash in them. How, in your opinions would the F75 and the Etrac do, if you have ever tried them. Would there be significant differences between them one way or another.