I did my live aboard course with Rob Swain in Tortola. I felt it was a great course and have sailed the BVI every year for the past 10 years since the course. Taking the course in the BVI worked out for me because on my first charter, I had already been to most of the places with Rob. This made the first time out on my own much easier. Also, Rob anchors almost every night, so you get a lots of practice anchoring and you'll spend the night on a hook several times that week.
I'm sure there are a lot of good schools out there, but if I had to do it over again I would use Rob Swain again and would do it in Tortola.