Used Bandicam, Fraps and few others for a while. Now i am using Nvidia Shadowplay and it's clearly superior, even though it's lacking many features yet, being a beta. Even being beta it uses the least amount resources of all recording software i used. 30 or 60 FPS recording, supports microphone. Can broadcast to twitch or just save on your drive. Very easy to use. And the best part - it's free. You got to have Nvidia card to use it though.
If you don't have nvidia card, Bandicam is a great option.