I've been very happy with my Whites Prizm II that I purchased just about two months ago. Found a pocket watch at about 10 inches and a license plate at about 16 (thought I was digging to china on that one)
Also have found a bunch of coins including a 1916 barber dime, 1913 wheat cent, and a bunch of clad.
Works very well at a local beach here in all the dry sand and have had moderate to good success in the wet sand.
But if you decide to go with this machine upgrade to the III with the depth finder. I often catch myself wishing I had.
Good luck and HH.