[brudgers]

>"I'm basically interested in statistical computing and visualization of large data sets."

IMO, there are two paths by which you can pursue that: experience and academia. The best experience route is to continue to grow and expand your business. The best academic route is a Phd, not another bachelor's. In an important sense, they're similar because either will probably take at least 5 years. And of course there is nothing to keep you from doing both.

Good luck.