Antonio,
I think everyone had some really good suggestions but I thought I'd add my two cents about the midwest in America. I know that in Minnesota (where I live)there are tons of jobs in the technical trade and that there is a pretty good transportation system. Of course, it is also pretty cold up here in winters but it would be a stunning and exciting change from Spain.
The education system here is amazing too, so that base is covered.
I also thought that the suggestions for Austin were great and it made me think about all of the hispanic immigrants coming into the Midwest.
I am certain that with the immigration explosion of hispanic peoples here in even smaller cities that there is a need for a bilingual technically skilled person. That is to say, you would probably be paid more in a situation where you have more than just your technical skills to offer.
Just a thought.