"
something for nuggets, coins, and the always welcomed solid gold bars ......"
Hah, I was thinking of adding to my post "..
. and don't say all of the above" (as this is the usual beginner answer to "what type things are you looking for?"). And sure enough, you said basically the same thing they all say "
all of the above"
So I guess, if there were some way to cross a corvette, with a truck, and a mini-cooper, then so too can the day come when a machine does a 2-box unit goal (the gold bars), a nugget specialty machine (for the nuggetts), and a coin/jewelry machine (for the coins)
There are some cross-over machines, but they will excell in none of the arenas. An MXT is a cross-over machine, but you'll get your b*tt kicked in competitive environments, if working tired worked out places where others have already gone. But sure, it'll "find nuggets" (pinhead sized sensitivity), and it'll find coins (with the flip of some switches, you can elect to pass birdshot, nails, etc... that normal nugget machines zero in on), and with some more audio tricks (ignoring small things by ear, desensitizing it, etc....) you can sort of mimick a 2-box unit, and only go for hubcap sized things and bigger. But .......... as I say, you'll excell in nothing.
If you can forgo the desire to go for the nuggets, you can try a Tesoro u-max. It's ok for coins, jewelry, and relicky hunts. Does well in ghost town type iron-ridden environments, gets small whispy jewelry if you want it to, separates targets well, is easy to use, etc... However, it lacks the depth that power-house deepseeker machines have, doesn't have a great deal of TID ability, probably doesn't bode well in mineralized ground, etc...
So again ........ it depends.