I want to star a stream but i'm unsire how to broadcast these classic game consoles. I understand I need a twitch account, software, and a capture device. But I am unsure what a good capture device is. I am using a laptop and even though I read internal captures are the best, I doubt one will fit in my Alienware laptop. Is there a good external usb device with at least av and s-video jacks? And would be nice it it had componet or HDMI as well.

What would probably be the best software/hardware combination fro someone who wants to do mainly classic game consoles and possible PS3? Cost effective alternatives that provide a decent quality would be best. I want my channel to be watchable.