LOL!
Actually I prefer the one you're using as your sig right now, I think the green one is just a little *too* green. Mind you, the name gets a little lost against the pale background, it would probably stand out a bit better if it was darker like on the green one...
The biggest problem you've got though is that none of them are anywhere near big enough for using on the KI forums.
Edit: Aha, I see you've changed it again, much clearer!