Hi, Assuming you didn't own either Windows OS, which one would you buy today now that both are supported in Boot Camp: Vista or XP? I've read here that Vista is very intensive to run, and XP is relatively more efficient. However, I would imagine that Vista is more future-leaning. So if you didn't own either one, which would you buy today to run on a Macbook? Thanks. P.S. If your answer is Vista, which version?