Dont' know about the salaries, but there's no way that you can get in (E)Spain... even the spanish controllers at Eurocontrol don't make it in there ( wihout a university degree ).
You need to have a university degree, and speak Spanish fluently. They have a language test that they make so difficult, a non-native won't make it.
The Spanish guys at Euro, are all in the university for some course to fulfill the first need, and obvioulsy, they will pass the language test.
The conditions are appearantly the best in the world, salary and time-wise...hence the guys over at Euroc. want to go back to Spain.
But, I hope I'm wrong and that you can find a hole in the net. Did you have any contact with people over in Spanish ATC ?