C4c:
I use TSC’s brand and love it especially since it has no fragrance added, doesn’t track that much, and is not very dusty at all so I am of no help to you.
The Petco litter is recommended by Catinfo. And if you want to think outside of the box (lol), remember that blog you found with homemade litter boxes a while ago? He suggested chicken feed. I am going to try that out this summer. Although the litter I get from TSC is only a few pennies more, I just have to try it out for the sake of curiousity.
http://catsadored.com/NEAR%20PERFECT%20LITTER/NEAR_PERFECT_LITTER.htm
