I believe that physically going into a college/university would be more appropriate on the motivation scale as well. It'l force you to concentrate on your studies 100% rather than having facebook and MSN open as you read your class notes.
If online courses are your only option though, I'd say to go for it, and maybe search around the web for testimonials or something. It's already wonderful that you're trying to find education, so take your time to pick the best method possible.
