I liked number 5 (those pop-ups from newgrounds are annoying)... ANYHOW... It is harder than numbers 3 and 4, and gives an ethereral feel. I liked 3 and 4, but, agree with Jimi that they are probably not right for the portal.
I liked number 2 okay, and found number 1 a bit too light.. Did i mention that those ads are really annoying.. that makes 4 pop-ups and I didn't even change the page.. =o(