I started with #5 when I first learned programming, back in 2000. Personally, I think the usefulness part is overrated - once you learn a language, it's pretty easy to learn another, at least for the typical imperative/OO mix - the concepts usually map pretty well. I'd suggest trying multiple and see what they find more rewarding.
The reason I thought #5 was the most useful is exactly the opposite: I thought that programming in the browser feels different.
There are all these other moving parts, remote libraries, and you have to check things remotely. You're constantly aware that you're plugged into the globe's APIs as opposed to the feeling of being in this little box.
