Tom_in_CA said:
This was especially apparent, for example, back in the 6000d series I days. (1978 to 82-ish): It would actually detect a dime DEEPER than a nickel. EVEN THOUGH the nickel was/is the physically bigger object. Doh!
Tom, you are so right about the 6000D's and those early White's machines hitting better on dimes than nickels. I haven't used an early 6000D in 30+ years but used to use one lots back then and forgot about that little peculiarity. Thanks for the fond memory!
My advice on silver mirrors what the others have said about other factors, besides which detector to use, being most important. In your price range almost any general purpose detector will be very good. Get something that is known to be a good performer but also simple, something like an MXT or E-trac, but there are many others. Then practice like crazy, learning its sounds, and testing yourself on each "iffy" target to see if you can guess what it is before you dig. After awhile you'll learn your detector's language. Personally, I think your odds are best with a detector that is known to separate well instead of being deep, but there are advantages/disadvantages to each strategy and only you can decide which is better suited to your style.
The most important three factors are location, location, location! Even if you can find a virgin patch back along a tree line or under bushes, even just a few square feet, at an old site, you will likely find some silver. Back in the good ol' days like Tom was talking about in the late 70's and early 80's, virgin ground was still everywhere. You could tell where someone had detected a site before you because there'd be a swath or two where you didn't find much silver and you'd realize a few folks had wandered around with a detector before you and got the silver in those spots. But large parts of the area were still undetected and you'd find silver coins just a few inches down that were easy pickins. Back then, silver had only been out of circulation for 10-15 years ... imagine nowadays when you go detecting and come home with a pocketful of clad, back then half of 'em would be silvers
There are still tiny patches like that left, but you have to be creative and persistent to find them.
Nowadays it's the opposite, there are only a few little patches here and there that haven't been detected to death, but you sure know when you've hit one, because you will frequently find several fairly easy silvers within a few feet of each other but not find anything else the rest of day. You have to think like a normal detectorist and then do the opposite!
Try those spots that are hard to get to, under bushes are one of my favorites, especially if you have to crawl on your hands and knees to reach in very far.
Most important is persistence and a positive frame of mind. Good luck!