#3 That filigree of book with people is growing on me. The "learning" seems out of proportion to the letters above it; is there a way to balance them as in #6 or #5, but I like the lightness of the font in #3. Our products are literally used en route and, while I get the feel of motion in this design, I'm not feeling the "on the go" piece as much. Feel free to work in other colors if desired; purple is a dominant preference but doesn't have to be the only color.
#4 Has a really professional feel to it that I like. The leftward portion could, over time, become a freestanding brand and I like that. Much like #3, the "learning" appears small to me, given that learning is a the end goal of our products.