[Help] Picking a banner network

[SystemGM]

Hello friends,
looking for a good way to advertise private server, thinking of banner networks that allow this kind of advertisements (like you may have seen alot of world of warcraft private servers rotating on different websites).

Not only networks, that offer advertising on game sites, but networks, that allow private servers advertising on sites where it can be effective. For example, i don't think advertising on Angry Birds fansite would be effective, but that will be considered as a game site by advertiser.

Thanks in advance