Looking for best cpc network to buy ads

Hi,
I am looking for the best cpc network to buy ads.
Must be Geotargeting enabled as I will run ads in different European cities (on American sites targeted to a certain country).
I already use Google, Adbrite and Bidvertisier.
Anyone got any good suggestions on good networks for me where I can buy my self (self service platform) and it is not to expensive(I( rather go very cheap of course )?
All suggestions is very much appreciated.
Thanks in advance,
R

See original post by rolf76