I also have another suggestion....past roomates and classmates of foreign origin who had to get caught up with the language and the accent quickly in order for them to understand lectures and whats being said in class used to watch a ton of movies...American or Canadian movies.....this will immerse you in the learning process and another second best way to practice your pronounciation..North American Radio channels wouldnt be base either..I understand you wont have the face to face encounter but this might be another strategy.

I also learned Spanish using Rosetta Stone....its not a bad product and you can learn pronounciation with it as it has options for it (might have tried it already but I wanted to bring this up too).

Good Luck....