Yeah, you could do everything Sallie Severns recommends, or you could do this instead: Don't buy lists. There's a simple reason why: Buying lists and getting solid inbox delivery are entirely incompatible. Period. End of story.
(And a tip of the hat to John Caldwell, Chad White, and Scott Cohen. I wouldn't have seen this article if they hadn't taken a moment to point and laugh at it.)
Update: Check out the comments-- the author holds up Datran Media and Hydra Media as examples of whom to work with.
Update #2: History has been revised: The post has been taken down. Apparently, we were never at war with Eurasia. My bad.