I currently sell text ads on my site on a flat monthly rate. I would like to find an ad network to supplement the ads with PPC or PPM, and maybe eventually replace the locally sold ads altogether.
If it matters, the site has an average of about 4 million monthly pageviews. I'm not interested in commission per sale, because it's too sporadic; I need the ads to be fairly reliable.
I had considered TLA.com until their issue with Google came up, bringing my attention to the "nofollow" tag. I've considered a few other ad networks, but they've all said that the nofollow tag isn't an option (except for one, who said that it could be added but that none of their advertisers would be interested in a publisher with the nofollow tag).
I'm not wanting to sell Pagerank here, I want advertisers that actually want valuable clicks.
Can you guys suggest a text link ad network that actually sells ads, not Pagerank?