One way of choosing your destination is based on the standard of the university you want to attend. If you want to go to uni abroad, but don't want to pick based on the Erasmus availability, it might be worth doing an independent application (applying for individual courses, along with local students) and checking the League Tables to make sure you know the reputation of possible destination universities. If you go to a prestigious foreign institution it could look even better on your CV, especially if you want to work in that country after you graduate.