广告平台

1. Admob

单价高

2. startApp.

按下载次数收费

3. AirPush

体验不好，价格也不高。。。

 http://www.appbrain.com/stats/libraries/ad

4. http://www.app-bucks.com

累世airPush 未体验。

5. http://manage.pingjam.com/

在来电添加广告，为体验

6. sellAring.com

在来电添加铃声广告未体验。

http://www.appbrain.com/stats/libraries/ad

广告版 类似 国内 芒果广告。

I would chuck some banner ads in there if you have room, mediating through a few networks.
I would recommend using Admob's mediation, with their ads, AppBrain's Ads and maybe inMobi or Moblicx too.

You might wana try an interstitial or two. Maybe at natural breaks or upon exit of the app. Try AppBrain's Appwall or Pontiflex if you have a lot of US traffic.

Hope that gives you some ideas.

Sometimes it's better to release without ads in to start and then add them in at a later date when you have a decent user base. That doesn't always work though.
I personally always release initially with ads and I can't see any negative results from that.