There are two kinds of Moog ball joints. One is conventional, with the rubber boot sealed to the body of the ball joint by a metal ring. These are the ones you want. The others are marked "Moog Problem Solver" and the boot is just a rubber cup that does not make a positive seal, and they have grease fittings on the bottom. These are the ones you don't want. I think they are likely to cause more problems than they might solve.

The old ball joints may be very difficult to remove from the lower control arms. There was a recent thread on just this topic you should track down and read.

As for additional parts you might want to replace at the same time, the strut rod bushings on these cars wear rapidly, and as you have to disassemble them to get the control arm off, it requires no extra work to install new ones. These are the cone shaped (with a tubular sleeve in the middle) ones that go in a round hole (2 1/2" diameter) at about the midpoint of the control arm, and are bolted to the end of a diagonal rod (round, 3/4" diameter) that goes inward and back at about a 45 degree angle to a bushing under the floor of the car.