Small, medium and large targets.
haha, whenever I post this "it depends on such & such" answer, I often times add the following: "...
And don't say "all the above". I didn't add that this time. And sure enough, that's your answer.
So to give an illustration: If you were to ask: what's the best motor vehicle to buy? And someone answered : "It depends on what you want it for. If you want to 0 to 140 real quick, consider a Corvette. If you want to shuttle kids to soccer practice, consider a mini-van. If you want to haul boulders to the quarry, consider a 10-wheeler truck. If you want gas economy, consider a mini-cooper", etc....
And the person answering says "
I want to do all of the above, so which is best?" .
See, it doesn't work that way. You might need multiple machines. And even within your answer is ambiguity. For example, when you say "small", are you talking pin-head nuggets? Or did you mean coin-size ?
And as for Terry's answer: Sure, you "won't miss anything" with that 7000. But heaven help you if you show up at a ghost-townsy ruinsy type site with a machine that "rings the bells of notre dame" over every fleck, staple, pushpin, etc.... Not that it wouldn't be great for some applications, but .... just saying, it depends on where a person is hunting, and if they need iron disc, etc.....