I'm sure that you already know this, but I thought (as a parent of 4 cute little purrs) to put in my $.02.

It's well worth it to spend a little more on good, canned food. I actually brought one male cat back from the brink of a nasty urinary tract infection with a small amount of medicine and a huge shift in diet. He went from bloody urine to a happy boy in a few days.

Also, stay away from fish flavored food. It can screw up the ph balances and cause problems (particularly in male cats).

May your purrs have long and happy lives!