Thanks for the replies.
I'm mostly interested in finding gold nuggets, and treasure hoards are relatively rare where I live. Besides, there's the question of unduly disturbing an archaeological site, which is worth considering. Nevertheless, I wonder where's the 'sweet spot' price range for a fairly professional piece of gear - I'm willing to spend around 1.000€. Not interested in a ROI, just in the fun it can bring.
BTW, Cofty, those are some neat findings!
Eden