I'd say python out of the 3 I've done so far in any depth. (python java and c++) although if you know HTML then php is pretty simple, but of course thats web programming as opposed to the others. But as previously suggested, choose a popular one so you can get help! because you WILL need it at some point, and if you don't you're doing it wrong.
I have somewhat double standards now, being as I learnt C++ first (still learning) and after hearing so much about python and how its a better language to start on than C++ I gave it a go. and it really is.
Choose whatever takes your fancy, but I'd stay away from C++/Java/VB
until you know the fundamentals and some more of the complex ideals in detail. Then you can start switching all around until you find a language you like.