entry #1. On the right track! Shade of blue very similar to the company NeuroFocus (www.neurofocus.com). We would like to see a slightly darker "electric" blue. Also the abstract image in the background should be more similar to the link we posted... an abstract brain.
We still like your first entry the best. The NM logo is very unique. Could this image be changes to incorporate a white background? Perhaps by outlining the white lettering?