The first thing I read about Team Yankee was that without dedicated AA anything airborne would eat you alive. So getting some VADS was high on my list.
I considered doing the whole magnet thing to make room for the missile carriers, but ended up deciding against it.
A group of four is pretty effective, when it has range. I find myself lusting after the Soviet Gophers with their fancy 56″ range. Or more precisely, my Cobras hate them.