Moonbase logo 1

First of all, thanks to @Meng To for the invite.

This is my first dribbble shot.
I'm currently in the process of starting my own company and in the last few weeks I've been working on, well... lots of things. One of these is designing my own logo... which is not an easy task! I'd love some feedback on a few logo's I've made so far, cause at the moment I don't seem to be happy with anything I've made. I really need some objective opinions on this.

Thanks!