Thanks for the information! I need to see what I can afford. My mom is paying me what she pays for pedigree, but I'm paying the difference. It looks like the NC is the best choice, but Authority would be alright.

I don't know anything about Authority, but if you are concerned about costs I know that Nutro offers a frequent buyer program (you get the 11th bag free I think) and some coupons on their website. Here's a link: http://www.nutroproducts.com/fbpnutroReg.asp
Also, if you shop around your area there might be better prices somewhere. I know around here, prices can vary as much as $15 per bag on the same kind of food depending on where you shop.
Also, I just thought I'd mention, since you said your dogs need to be on a diet, I always have to watch Marta's portions as she gains weight easily. She eats the same kind of dog food as Adele (who will always be skinny) but I just give her less and add some carrots to her bowl instead, they help fill her up, but are a lot less calories. I think it's easier than feeding special food, but of course that works too! Good luck with your search!
I do try to watch portions, but my mom feeds them about half the time, and gives them a large plastic cupfull each, sometimes twice a day. I only try to give them 1-1/2 measured cups of food twice a day, as there are little kids here and they get enough table scraps (aka, food that fell on the floor). They are on a type of free feed-they only eat twice a day, but they don't chow down right away, they eat when they feel like it, so it's hard to only give the one that really needs it less portions, as my other two don't really need reduced portions. Thanks for the info though.