Another aspect you may want to look at is how the entire website flows and makes your eye move, like looking at a piece of artwork. The idea is flowing except for the large watermark right in the center of the screen. It just does not connect the flowery font with the more impacting, trendy graphics on the left. You could possibly create a watermark that wasn't so centered and would combine both the refined and trendy elements of the website.
I don't see a problem with the more "techie" +'s and brackets. I've seen those elements in other graphics for extreme sports, and they fit because it is of course a website, and is being viewed on a computer. I completely agree, however, that you could add some more "urban" feel with speed, scratches, etc.