[The General]

As far a spoilers, I have always preferred the lip-type spoilers just to accent the rear a tad.

Overall, I believe it's cheaper to buy the ground-effects together as a package, however, if you don't want to do that, I'd recommend buying the front first, see how that looks installed, then the rear, then the sides, etc. The front definitely provides the most change in appearance; the sides provide the least.