I use VCM and Casale on my arcade/entertainment site. I've given you a link to some quick information about the 2 cpm ad networks. It's the first 2 listings on that page. You could also try some of the gaming/entertainment related offers in some of the cpa affiliate networks. Good luck.
You might try something like Inbox Dollars - get paid to play games text or banner ads or one of the other incentivized sites that offers paid gaming. Also, you might try something like a get paid to site that offer free games and gaming systems for free offers. It'd probably work well with your demographic as well. I have some tips in that area so feel free to contact me if you want some additional tips and info for this type of offer. Best of luck to you man.