I've had a couple threads here and here which have some games we could play. Or feel free to list a new one here. Be sure to read over other people's suggestions first to ensure it hasn't been posted yet. Also make sure to put a description, video, or link to the game you are suggesting. Free games are always a plus but cheap games can be suggested too. My current suggestion is Goldeneye Source as last time we played everyone had a real fun time. Second suggestion is The Hidden Gmod version as CounterCraftz recently set up a server for it and we have had some good fun with it.
If we want a Garry's Mod server, we could always hook up with one of the gamemodes in facepunch or the workshop as well.
I'm up for Goldeneye. We can always hop on Mount Your Friends once it dies down or if the turnout is small too.