Thanks for all the replies, and my apologies for a very delayed response...
I felt I should provide an update though. The cat in question is *much* better. A few weeks ago, she had stopped eating, was urinating everywhere except her litter box, and spent her day curled up in a corner (probably Hepatic lipidosis). These symptoms progressed as the vets were running tests and trying to determine treatment. After an ultrasound, they found she had about 20 bladder stones, and we arranged for surgery. On the day of the surgery the vets took one look at her and decided she was in no shape for major surgery. Instead, they put a feeding tube and IV tube into her, and kept her overnight. The next day, they removed the IV, and we brought her home. We have been feeding her through the tube since then, she has regained her weight, and is basically back to her normal self. She had her surgery a couple of days ago, and is recovering very well. Indeed, as I type she is sitting on my lap and purring... she actually sounds as though she is cooing.. like a dove.
In other words, she is back to being my "familiar," as my partner likes to call her.
Where the diet goes. We have tried some of the raw food out on our cats. As I said our butcher sells various types, and it includes bones, and organ meats etc. *sigh* We tried some of the poultry type and neither would have anything to do with it.

This is odd, because they both love (cooked) chicken and raw chicken livers.
We do buy them high grade "kibble" which only contains, basically chicken and brown rice along with supplements like taurine. But after beginning to read around I really wondered if maybe the raw food diet would be an idea.
I'm beginning to think that maybe the best plan is to continue a combination of kibble and chicken livers, though increasing the amount of livers, usually we give them some every couple of weeks.
@Than, thanks for the links, I will check those out as well..
We'd both be happy to let them hunt. Only problem is that we live (presently anyway) on the top floor of an apartment building, so the best approximation of hunting the cats get is leaping after bugs when we leave the patio door open in the summer
It may sound great that my cats are getting organic yams, cranberry, and rosemary along with their free-range, non-caged, omega 3-plumped rodents, but are those things really benefiting them?
Yes indeed... And the thing is, we were actually feeding our cats a brand containing those ingredients a few years ago, it may have even been Wysong, I can't quite remember. And, Luna, the same little troublemaker as described above, had an allergic reaction to it... This is why we ended up with the California Naturals brand since it doesn't contain cranberries and similar ingredients.
Good thing Pepe, our other cat, is low maintenance, we refer to him as "The wash and wear kitty."
