I have been MDing since the 1980's. I have Plenty of land machines. I presently use a Tesoro Sand Shark, love the machine, but running low on o ring gaskets. Sooo, I'm thinking of replacing it. Now I'm getting myself confused. I'm looking at the Nox 600 or 800, the nokta salt water proof machine thats around $700 bucks, also there simplex, the Garrett Sea hunter , witch is like my SS. Also a Excal, but don't care for the problems associated with that machine, knobs, shaft problems. I'm open for any suggestions for other salt water machines, I hunt dry sand but mostly the surf. Help a confused old man.lol.Thanks.