Hi,
any mid-priced detector is a great start. Consider an American-made one first. I say first, because if you are really into the hobby, as a real passion,
you'll find that someday you'll get another machine as well (mark my words)
Anyway, once you got one, learn the heck outta it! Use-it-a-LOT! Get to know it real well...,
because you'll likely be digging less trash targets, and more good stuff...! really!
Keep that owners manual handy, as you should be reading it OFTEN...!
Good Luck and Happy Hunting, friend!