How can I teach English in Spain?

I am interested in teaching English abroad. I have a 4yr degree in Finance and am planning to get a 120hr TEFL certificate.

I know Japan and Korea are big on it and pay well. Thailand, China, Czech Rep, and Russia are options but don’t pay as well as the others.

I would really like to teach in Spain, my great-grandfather is Spanish and spending some time there might qualify me to be a citizen.

I’m a U.S. citizen, do I have a shot against the Euros? Where can I find info on teaching English abroad?