What's a good alternative to AdSense for a small website?

If Google AdSense is not an option and my website displays content that might be (sometimes) objectionable, then what is a good PPC ad network I should sign up with? My website is fairly small, with 100-120 hits per day only (it's 8 months old).

I would like the ads to be contextual or ad least sense-making. I don't want "Download" "Watch Now" type of ads. I need useful ads.