My experience of QA courses has been that they are all pretty basic.
IMHO the only ones worth doing are Developmentor (
www.develop.com)
Having said all that I've not done a single course since I've been a contractor and have learned far more than I did when I was permie.
You also need to factor in the money you'll lose by not billing for the days you'll be on the course.
I'd recommend a Pluralsight account as mentioned above and a Safari books online subscription.