Back in the day I had 90/10 and 70/30 frt struts and 50/50 rr shocks on some of my fox bodies and it worked really well, anyone try these with their newer mustangs?
That said, I would not even bother replacing the rear shocks - unless you were getting adjustable pieces.
For the fronts, I'd MUCH rather use, recommend, and sell a set of Strange Single Adjustables - which are only $139.95 each.
Since you have an automatic car, your best set-up initially, would simply be the stock shocks and some strange single adjustable front struts. It may not be the best on paper, but in the real world, I have people going very quick on that combo, with an auto. With a manual, I'd say opposite....as the rear shocks need to be dialed in first and foremost.