Ok, now when I come back to these designs, my personal favorites would still be concept #150, with its mono and negative space versions.
#163 turned out interesting, but maybe a bit too crowded,...#150 looks more serious/profesional/calm/trustworthy, and has all the elements to tell the story about the work you actually do,...also has unique outline, recognizable from far away, without any dillema, what is the company behind the logo all about.
Hope this little analysis helps a bit! Let me know if I can be of further assistence! Thank you!
Bojan