I have worked with several PPC systems at the same time. Feeds have been installed on several of my sites. I compared, and stood on one system - BizzClick.com I was happy with everything. The high bids, they are constantly evolving, do not stand still. Therefore, there are new instruments, increased convenience. And this system is very fair with respect to the webmasters and advertisers.
read the forums, there are many discussions. Сan read the blogs, here, too, a lot of useful information. And of course the news. Here is http://www.bizzteams.com/ the news about SEO, SMM, SMO, reviews of exhibitions and interviews. A lot of useful information. And of course, improve your knowledge in your own projects.
Try system PPC BizzClick, can be like that? Look for your keywords. I once compared, there is the highest bids. With this system have been working for about 4 months. Support is responsible at any time, payments on time. Reviews of other webmasters about it too good ... Good luck in your quest ...