Where would you live? In your own house? On your own island? Or somehow work in a company that lets you spend your free time working on an open source project?
But I'd certainly go for maximum independence so going to work for a company if I don't have to (which presumably I won't have to if I sell a startup) is out of the question. I want to be able to pursue crazy projects that might or might not turn out to give results.
Oh, and I'd crank up on my knowledge of theoretical CS too.
