There are many networks to choose from.I cant say all of them are best as I did not work with all of them.But you can take a look at the followings and you can try to get more information about them from web. -ValueClick Media -http://www.axill.com/ -http://www.tyroo.com/
I am using Axill - from last 18 days Impression is 60k+, 424 Clicks, Net eCPM - 0.06, is that ok or problem with this network.
i thinks more traffic is more revenue of your click. no matter about the cpc but it is better for you having a little cpc but more traffict than big cpc but less in traffic. we talk about quantity right. the opportunities will open when more traffic is being on it. ciimw
Dont try axill.com just read out my previous post at http://forums.digitalpoint.com/showthread.php?t=2349894#post17155594