My Logos - Ideas

These are a few variations of ideas for my Graphic Design company logo. I'm leaning towards the one in the center, but the two on the left look appealing as well. If you have any feedback please let me know in the comments, they would be greatly appreciated in which ones you like and why.

In the end I picked this as my final logo. Reasons behind this were it's simplicity yet emphasis on architectural structure. One of the things I wanted the logo to say was how precise it was, and this is a very sturdy logo. The red also captures attention and stands out, and the logo is still legible when scaled down. Being still effective at gray scale is also a priority, which it is.