I have been really happy with aftermarket swaybars. Really leveled the truck through the turns and reduced roll, making aggressive turns more predictable. First I had an Addco, which I was very happy with. It was damaged in an accident, and I replaced it with a DJM bar. The DJM is even stiffer, which I love. People have also said good things about the hotchkis rear bars as well. Generally speaking, the front bar on our trucks is more than adequate. I just replaced the front bushings with urethane to increase its performance.
Oh and those mods you listed are the best bang for your buck. PCM4less Tune, shocks and struts, and it will be like driving a new vehicle.