I'm trying the same as you, I have the same doubts, and I'm thinking about using trek advertising, although 1 of my adsense accounts once was banned for it (trek adevertising).
Maybe I've been a ilttle greedy that time, now I'm going to try in a mor low profile way.
I now that I'm not being very usefull for your questions but at least we are two needing same answers.