You only need poly bushings if you going to lower the car, otherwise its useless on a stock suspension.
Now if you are lowering, you will find that the bolts for the rear lower control arm that the spring sits on is seized in the bushings on both sides, so you will need to use a articulating saw and cut both bolts on each side and get new lower control arms, or you could push the old bolts and bushings out the control arm and buy a bushing kit for $130 on CFM.com.
And the CFM bushing kit comes with 12 bushings for the rear, 4 for the two lower control arms 4 for the toe arms on both sides, and 4 for the camber arms on both sides.
Here is a pic of the bushing kit, I love it, well worth the $$$.
Now if you go lower then 2.0 inch's then you will need a lot of camber and toe adjustment parts. $1300 dollars worth to get the allighnment perfect.
But if you don't go lower then 2.0 inches, then all you will need is a set of camber bolts in the rear with 1.0 degree of extra camber.