My girls get Iams only. Because the nutrition can't be beat. Yes, it's more expensive than some brands, but not as expensive as things like you buy at the Vet.
I've had luck with Purina Indoors for Jazper. It's about half the price of Iams and he likes it (he's picky about dry food).
You can visit my cats @ Purrchance To Dream

Here via Entrecard.

I would recommend an all natural formula with no grains, as cats don't digest grains well. Wellness grainfree, Innova grainfree, and Felidae are ones I use. Wellness and Innova are a bit more expensive, whereas Felidae is less but still a good formula. I would also recommend feeding raw meat (including organ meat and ground bones) and vegetables - you can make it very cheaply. My blog deals with cat diet, the benefits of raw feeding and how to feed raw food (http://wildcatsthree.blogspot.com)

Wow everyone, thanks for the recommendations. I'll be trying them all out as long as dear Lucy doesn't scratch me for changing her favorite foods!