Please see my Litter Box page linked below.
Dr. Elsey's is also my first choice.
Whatever you decide, please make sure that it is a CLUMPING litter for all of the sanitation reasons outlined on my website. (You can completely remove the feces AND URINE...unlike with non-clumping litters.)
This is often a hotly-debated subject with strong opinions in all camps but my...strong opinion...is that non-clumping litters are unsanitary. I deal with a lot of inappropriate elimination cases in my consulting work and, by far, the number one reason is a dirty litter box......with the problem often fixed when the cat is given an UNscented clumping litter....that is scooped a *minimum* of twice daily.
I also have dealt with a lot of cats that will not use pelleted litters and even if they will use them....the human often allows the cat to continue to walk through urine-soaked pellets that turn into sawdust or newspaper yuck.....which is not very fair to the cat which is a fastidious creature, by nature.