to reiterate stream's advice, save AVIs uncompressed and then get divxx to compress the finished movie. this way you deffinitely get best quality vs compression.
you can get divxx for free, search the web for it.
i find fraps gives poor quality for AH2. its great for any other game, just AH2 seems to have a tough animation code to capture.
ge fraps for free at
http://www.fraps.com also
stream, if I subscribed to the full version of fraps does the capture quality improve?