If you buy new, the detector most recommended for $200 or so is the Garrett Ace 250, I think $212.45 is what I've seen new & expect to pay about $150 used.
Some older detectors are OK, too, & prices vary at auctions like eBay. But the older detectors may weigh more & some don't even have armrests, so they can be more painful after a few hours use.
All detectors can detect gold & silver, & probably meteorites, are they mostly iron? I never studied them & don't expect to find any.
For gold, the ID if a detector has visual ID it might say foil, nickel, pulltab, or screwcap, or zinc cent, due to the various sizes of gold objects & % of gold content.
Hope this is of some help. Good luck & happy hunting, George (MN)