You will really like the improvement of the sway bar, it's very noticeable. I considered my truck nearly undriveable because of the extreme body roll in curves, it just didn't feel safe. I was lucky enough to find a junkyard with a bunch of them, and they pulled one complete with brackets for $40. Added $22 Moog poly bushings and $10 worth of grade 8 hardware and it was done.
I wouldn't hesitate to do the Addco from Summit if you don't have a junkyard close and/or time is an issue. It's really a huge improvement regardless of the cost.