Best Capture-Card Software For Recording Xbox 360 Gameplay?

Okay so my friend and I recently started a Minecraft YouTube channel where we plan on making Minecraft videos, anyway. I have a Gigaware capture-card that I'm using to capture gameplay with and stream it to my computer, that's all working and everything is fine, HOWEVER, the Gigaware capture-card came with Showbiz as the capture software and it's really, Really bad. I've tried Camstudio, Arcsoft Showbiz5, etc, etc. Some of them do fine, but while editing the video or watching it on playback it lags too bad for me to edit, can anyone out there recommend a good capture-card software that will run smoothly?