I am considering buying ad space on a number of websites and I would like to see if you all have some advice as to what programs would be the most profitable to do.

The first site is Lifehack.org. They charge quite a lot for monthly advertising, but I would get access to around 800,000 visitors.

The other one I am seriously considering is the MoneyBlogNetwork.com page.

I can place multiple ads in each banner and was considering doing a combo with LifeLock.com and a debt consolidation program. any ideas?