Like was mentioned prior, you can certainly start out with just the AEV system and then add our components later. If you get the AEV kit without their drop brackets or adjustable control arms, you will experience a good amount of wander on the highway since your caster will be very low. Be sure to keep that in mind.
We do admit, that the smoothest riding arm on the highway alone is an OEM arm with the clevite bushings at one end. Why do we not offer our components that way? Well, the answer is simple, we expect more from our Jeeps than to be just driven on the highway. Offroad, the clevite bushings will twist, but that demands of off-road of the bushings, especially at the axle end where all the work is happening, will cause an issue. The clevite bushing itself will eventually fail, or even worse, the cumulative stress put on the OEM lower control arm mounts at the axle from forcing the clevite bushings to twist will eventually cause a fatigue failure of the them and the lower control arm mount will rip right off the axle.
We feel our arms are a nice comprimise. We put a nice, sealed, rebuildable spherical joint called a Krawler Joint at the axle connection and use the industries largest PTMEG bushing which also has off-road features built into it. The spherical joint takes all the twist you can throw at them and keeps asking for more with no induced stress on the OEM lower control arm mounts. Our arms also have high clearance bends in them for improved cross over angles. Drop brackets will hamper your cross over angles.
Good Luck with your build... Give us a shout if you have any questions.
BTW, our 3.5" systems offer 4" of lift up front and 3" of lift in the rear.... Just for information..