Can you try a different logo, something with a scientific theme. I feel like the text color is a little too dark in Entries 1 & 2 and too light in Entry 3. I like the font style though.
Also, we've revised the slogan to be "The Leading Source for Educational Science Kits and Toys". Can you revise that? We like the "scientific" feel of the emblems, but not quite those....maybe try Silver and Purple, rather than black and purple?