I live a few hours away from target so I havn't tried them yet... but plan to on my next trip. This is my first baby so I have been cautious about switching brands because I have very sensitive skin and wasn't sure how she'd do.
I have tried Huggies, Pampers swaddlers, baby dry, and cruisers, parents choice, and luvs. I like the fit of pampers best. My favorite is the swaddlers, second favorite is cruisers. They both have the same inside and seem to hold better.
Pampers baby dry has an inside like luvs but a different fit. I have never had a problem with luvs during the day... never tried them at night because my baby sleept through pretty early on and was afraid they would leak. I have found that Luvs are roomier than Pampers so Lena is in a smaller sive of luvs than pampers most of the time but hey... there is more in the smaller size pack anyways.
I thought parents choice was fine but didn't fit well and my baby had a hard time with rashes on this diaper. I have been told that they changed them recently by another mom and that she doesn't think they hold well anymore. But that is her oppinion.
We didn't think that huggies fit well and I always had a leaking diaper with this brand. I change my baby at least every two to three hours unless I know she needs it sooner so there is pretty much no excuse for them to leak in that amount of time. When I say leak with huggies brand I don't mean pee. My baby was breast fed so I had to be careful. I also found that most packs of huggies usually had less diapers than pampers for the same size. I have also been told that huggies are better for boys than girls. Maybe it's true, maybe not. At the time I didn't realize that huggies has 3 different kinds kind of like pampers... so I am planning on trying the other ones soon.
I have been told from at least 5 moms that Target is the way to go... and I guess that they have coupons for that brand too, so I plan to try them.
I just look for the best diaper deal (on pampers and luvs because they are my favorite- and like another mom wrote, I don't have to wash so much clothes) and really stock up. JMO.
AS FOR FORMULA
I breast fed until my baby was 8.5 months and she refused to keep at it. apparently she had better things to do.

That is cheapest. Only real purchase is a few good nursing bras. When I had to switch to formula I tried: Goodstart (which I guess used to be carnation but is now nestle... and made by the same makers of enfamil from what I've been told), Similac, enfamil lipil, and parents choice.
If you read the ingredients label you will find that both parents choice and target brand has a kind that is exactly the same as enfamil lipil (which is closest to breastmilk).
My daughter hated similac and if you smell it you'll know why. It smells like really strong vitamins (and call me weird, but i tasted it and I think it tastes like a liquid form of prenatal vitamins-yuck!)
I then went to goodstart... she liked that a little better but it made her spit up. Cheaper than enfamil though.
Then I tried enfamil lipil which smells more like the powdered creamer. So it doesn't taste like vitamins but it still has a ton in there. She took it right away. The powder was more fine than goodstart and the formula was whiter that similac and goodstart which is nice if you have a baby that spits up a lot because the spit up doesn't smell as bad and doesn't stain their clothes as often. But it is expensive.
Parents Choice has the same ingredients, but must taste diiferent because my daughter won't take it straight. It also has a heavier, more damp texture than enfamil.
What I do is put half parents choice and half enfamil in her bottles to make the parents choice taste better. I am not skimping on the vitamins but she'll drink it when she won't take straight parents choice. Also if you put formula in your babies cereal you could use just the parents choice... My baby likes cereal best with plain water but for babies who like it with formula that would help save some money. It saves me quite a bit of money that way.
You could probably do the same with Target and target sends out coupons for theirs... I just havn't got around to trying it yet. Like I said, I live a ways away from Target.
This is just my opinion but I hope it helps.