Well to lower your car as much as you're asking to lower it, I'd say they are strongly recommended. I would not suggest lowering it that much, if you do not plan on purchasing those items.
It sounds like you want to lower over 1.5 inches, because you're unhappy with the look of that drop. So lets say you wanted to drop 2 inches. There is the
Eibach Sportline kit,
H&R Super Sport, or
StangSuspension Series IIsprings which lower about that much.
If you purchase aftermarket shocks & struts, expect a better, smoother, more controlled ride. The camber plates will help align the car after lowering, which will be a necessity at that drop. At minimum, go with
Camber Bolts, which will help you save money but still get the job done.