What's the best kind of microwave popcorn?

I usually use Newman's Own, the "natural" variety, which is somewhat buttered (I dont know why they call it natural...) and I like the brand for various reasons, but it's not perfect. What is everyone else's favorite? Im not a huge butter person. We also keep Jiffy Pop and raw kernels in the house for stovetop popcorn, but sometimes its just too convenient not to do microwave.