Another option is the
Tachyon OPS HD at $139. It's a very small camera that weights under 50grams. It is slim and because of the way it attaches to it's mounts, it can be positioned in pretty much any orientation. The only recording setting it has is 720p at 30fps, though. I wish it had a 60fps setting but it doesn't. But it can record for 4+ hours on a single charge and can use up to 32GB memory cards.