Hi L. ~
My sympathy on your loss, and my congratulations on preparing to open your home and heart to another kitty!
I've been a momcat for over 30 years, and I have tried just about all the litters out there. I recently discovered the best so far when I was taking care of a friend's kitties while she was on vacation. She buys it at Sam's club, where it runs about $10 for a big 40 lb tub. It's a Scoopable litter called LitterClean. I always preferred either Tidy Cat Scoop or Fresh Step Scoop, but I have changed for good now.
My friend told me that her 17 year old kitty has always had a skin disorder that appeared to be an allergic reaction to something. Over the years, they have tried different foods, different litter, and different everything. After using LitterClean, her kitty miraculously stopped having hot spots and open wounds. When they ran out and bought another brand in a pinch, the hot spots returned, only to clear up again when they bought more LitterClean.
We have one (of 3) cats who has always had a problem with throwing up before he eats. Since we started using LitterClean, that habit has nearly disappeared. I can't say for sure that it has anything to do with the litter, but I can't thin iof anything else that has changed in our routine either.
LitterClean clumps extremely well, controls odor really well, and is a bargain price. It is also not heavily perfumed, which is a huge plus for me, since I have my own allergies to heavy perfumes. We don't belong to Sam's Club, but my friend picks up litter for us now when she buys for her own kitties.
Now that I've posted my own reply, I'll be interested to read what other momcats have to say. ;-)