The Sharp, Snake and Sharpshooter are great forGold, Coins and Jewelry. The Hunter on up is great for Iron/Brass and relics/artifacts, plus good if you hunt caches.
NEL/CORS gives a more specific choice in coils over manufactures offerings. Usually the 10 to 12" DD is the "all in one" offering for everything. But the vast selection of smaller and bigger coils, helps define the line of hunting one wants to do.
Personally, I wouldn't buy a Hunter since my detector came with an 11"DD. But for my style hunting, the Snake would be my next choice if I bought a NEL. Once coils exceed the Hunter, you better be field hunting, as masking is going to be a big problem, not to mention ID of the shallow objects.