Methods

Hey all,
I've been into 3d as a hobby and learned a little about a lot of programs and now I've decided to settle into one program and use it to learn through and through. Later in life I would like to do this professionally, but not for a few years.

I've looked at all the 3d apps out there and I can't decide which one to focus on. There's Lightwave, 3DS Max, Maya, Softimage, Maya, and Houdini. Which one should I take the time to learn?

I like the fact that the Houdini community is still young so it seems the right time to learn from it. Would I be able to to fully utilize Houdini Apprentice to fully exploit the program without any restrictions on functionality? How is the learning curve of Houdini? I know enough of 3d graphics and animation to get around and accomplish basic tasks, but not enough to fully realize certain program's potentials.

Any help is greatly appreciated!

P.S.
What companies currently use Houdini?