-
Looks like a great starting point - I especially like #4 (though I can barely tell the difference from #5).
The first three are a little too "spoon-fed" as far as the "this site has bar graphs" message. 4 and 5 are subtler and more elegant.
What I'd really like to see - is the logo in context. If the website it adorns is bland - you might want to go with a graphic element besides the text. If the site is visually engaging already - just stick with #4.

Thanks for the comments!