Awesome logo for a construction company

Construcciones Sustentables de Celaya

We are a construction company we are relatively new and based in Mexico our name in english means "Celaya's Sustainable Building Company". "Celaya" is the name of the city we are based on.
We create and develop construction projects. We use innovation to make a difference in the world and we focus on sustainability.
We build everything the clients need, from a wall to a highway bridge. And hopefully someday even skyscrapers.

We develop projects mainly for the government but we want to be appealing to the general public.
We focus on sustainability but that doesn't mean we don't create "normal" projects. The sustainability is everywhere in the company, from recycling paper at the office, optimizing the transportation of raw materials, to using and promoting the use of alternative energy at the homes that we build.

We want the logo to be creative, to represent the innovation that we try to achieve in each of our projects and show that we care a lot about the environment. At the same time we want or customers to feel confidence in our brand.

Somethings to consider:
We want something simple (but awesome)
We are focused into innovation and technology
Our main client is the government so it can't look cheap or childlike.

We know that the name of our company is very long so if you believe that a short name would look better you can use one of the following:
CSC
CSCelaya
Construcciones Sustentables de Celaya

Please feel free to experiment with colors and designs.

The files we will require are:
well need a very hi quality image (we want to print to billboards) in layered .psd (RGB)

In case that you use regular fonts we'll require the name of the fonts so we can keep our webpage in line with our logo.
Please do not use any stock images or clip art in the logo.

We already have a logo that you can check at our website (http://www.cscelaya.com), we like it a little, but we definitely don't love it...