Waggy leaves are common, as are YJ's thanks to the Blazer's relatively light weight. I did a lot of research into this too, as my original plan was a SAS on an S10/Blazer.
Lots of threads and sites out there for SAS info on those trucks, and I think that leaves are the way to go for a cost and ease of fab route. I think most folks move to the Astro steering box too...mounts in the same holes, but swings 180 degrees from how the S10 box does, putting the pitman arm in line with where it needs to go.
Good luck, and take lots of pictures of the build for the rest of us!