All good advice from Rusty. I myself go back and forth between using a shooting head system and separate intermediate/ sink tip lines. One line/tip you really can do without in NJ salt is a full floater.
I tend to go with my shooting head setup when I am going to be onthe water for a long time and may see a variety of conditions, tides, and currents.
The quick versatility of the shooting head system is a huge plus, not to mention they cast a mile once you get the hang of them.
My only issue with running line/shooting head systems are their propensity for some nasty tangles in the running line. In the dark, even with a headlamp, this can be a major PITA. Make sure you stretch your lines before hitting the beach not matter what you go with.
For a integrated sink tip I like the Teeny lines, and for my intermediate I use the SA striper line.
~James