CPM, CPA and CPC networks work well with entertainment type sites. There's many of these networks reviewed at http://www.affiliateseeking.com in the "ad networks" and "affiliate networks" categories. Personally the best I have used for entertainment is:- CasaleMedia - CPM VCM - CPC/CPM Peerfly is good, but not tried them for entertainment sites, so not sure what they are like for that sort of site.
Here are the few networks worth joining- EWA Private Network Azoogle Neverblue BlamAds Optimal Fusion
You could try Amazon, or if you can get into the Ebay Partner Network it will be an extra way to monetize that traffic
The choice depends on type of advertising you are going to run. If you need CPM networks, try CasaleMedia TribalFusion (these two are difficult to be accepted to) CPX ClickSor DSNR Oridian These are the networks I have good experience with.
Since your site is about entertainment, you should try epicgameads. They pay you up to $5 CPM rates. And they also do CPA and CPC!