What video capture should I get?

I want to get a usb video capture device. I am only going use it for video games. I want it to be a HD usb capture device that makes videogames look amazing. Then i don't want t to be that pricy though. Like the cap is like $100. I already looked at the Diamond VC500 One-Touch Capture and the Diamond VC600 One-Touch Capture. But, im not sold on them yet.