Hadn't thought about using a yellow background as in #4 - I like that idea, but white also looks really clean. We were likely going to use white as background on the site, so might be best to do something with yellow highlights in the design. I like the glossy yellow on the globe in #6
#7 and #6 are neat, I like the magnifying glass and the globe... really points to what we're doing. Would really like to see a modern, crisp font style. Something techy.