I'm sorry to hear about Rudy. It's a little too "dark" for me - and that could be because I'm having a hard time making out the actual picture. I like your thinking though with abstract for the logo!
#4 is my favorite of yours so far. I think the colors may be better if it is a Darker Blue and Gray or Darker Purple / almost burgandy and gray. But, I like the overall look. Thanks.