Thanks everyone, for your comments about the food.
I think that for now, I'm going to continue with the Purina One Chicken.
I did a lot of reading last night after I posted, including a couple of FDA pet food articles, and found some interesting stuff. A couple of things in particular stood out to me:
1) Many of the premium foods list 'whatever-kind-of-meat meal' as their first ingredient. This is essentially meat that has been cooked/processed with the water removed, and then powdered so that it can be formed into dry nuggets. Purina One and others of that ilk list meat (in my case, chicken) first, not meat meal.
The thing with this is, that supposedly in the meal kind of meat, the water is removed, so by weight, you're getting more protein than if it's simply listed as just meat, which does include the water in the weight, as in Purina One. However, there's debate as to the actual nutritional value of this (chicken, as opposed to chicken meal, for example) because in the case of meal, it's cooked and processed so many times that some are questioning whether there's as much protein actually left in it as there is in the foods that just list the meat as the first ingredient (and only needs to be cooked/processed once, as opposed to meal-type meats).
2) I also read that while people try to avoid meat by-products, it's really debatable whether or not they're actually bad, that in the parts of the animal used as by-product, there can in fact be more nutritional value than in just the 'meat' parts alone, and the main problem with by-products is that it's not aesthetically pleasing to humans to think of eating those parts.
Anyway, it's kind of interesting, and there's really no definitive answer out there, I think what it boils down to is, if your pet is on a food and is healthy and happy, then it's all good.
Great news about Worf, Kelly, so happy for you guys!!
Kitten pics tonight hopefully, it's been a crazy week.
Oh! I need to add a 3rd point about cat foods. According to FDA regulations, the only cat foods they regulate and test for nutritional fulfillment of life stage or special needs for cats are adult/maintenance formulas, and growth/kitten formulas. What this means is, if you're buying a formula labelled as preventing hairballs, weight-loss/lower calorie, for senior cats, for indoor cats, etc, those formulas are not regulated or checked by the FDA, so there could be anything in them - it could be just normal adult food that they've stuck a special label on! So if your cat is on any of these, beware, and read the labels to make sure you're actually getting what they're claiming you are, and that you're no doubt paying extra for.