Need more info. What CPU, and what other components do you have or plan to use?
I don't know what I'll be using yet: a video and sound card probably and a lot of ram for browsing. Personally I think 2 cores will be plenty but we'll see. I'm trying to get information to make the best choices. As long as we can get the best video and audio for streaming content, and minimize lag while browsing. That's about it.