I'm a Daver.
The previous comments are very true, I went to Dave School, and learned Lightwave, the investment it's been returned many times over at this point. With that said, I have seen and worked in some studios that are Key players to the Lightwave community in L.A, and have stopped using lightwave, so the Lightwave pool for studios is getting smaller.
Even though I've not been to Gnomon, I'm an avid fan of their tutorials for Maya and Z-Brush and whatever else they can put out. Very talented group of artist running things over there.
From my experience, I can say that the learning curve for lightwave wasn't as steep as for Maya, which I still don't know everything about, but enough to supplement the tool box.
Truth is, that in this Industry you'll probably start by focusing on one program at first, and once you have more experience and needs, you'll venture on to other programs, and before you know it, you'll be using whatever program is best for the task at hand.
Just if you were wondering, here's my stuff, and the breakdown shows the program used for each job.Demo