I could put down money for direct feed-recording-devices, but a camcorder can more easily capture the silliness that conspires during my group’s matches (Some of my favorite Obot-videos were best because of what was going on besides the game, for example), and camcorders can also record other things.
Can’t reccomend a specific model, since I have an old Canon, but I would go for a Sony. I have heard that those are great for recording in dim light (I don’t know if that applies or not)