#4: The Lab instrument doesent convince me very much; neither do the arrows.... although, it is much better than the other options.... the "Hybrid Think Tank" looks good!... I think that other colors should be used in "The Communications Lab". Lets play around this idea. I gave some web sites as refference. They might help you out.
#5: This option is getting closer!!! Although more colors would be appreciated. The "t" fit in. The font used in "The Communications Lab" are good.... The fonts used in "A hybrid Think Tank" I don’t know if they should be in italic.