As for SMF's go as muck as I like Nokta machines their support is lacking. That leaves the options as Nox 900 or on the higher end D2 or Manticore.

If Beach hunting isn't a major factor the D2 might be the better choice simply because of weight and ergonomics. It will also provide hours of entertainment scrolling through the menu's trying to figure it out or you can download the manual and read it at the field while others are running around digging