Wow, all in NURBS! That's awesome.
I personally like Kurt's method, of roughing out with NURBS, then converting to polys to add the geometry and shape, then sub-d's for final details... but the question is, do people really use this method in the working world?
If so, I'm set!
I've been trying to learn box-modeling, and all that jazz... but it's confusing to me. I find NURBS or even the poly by poly method (at least for head modeling) to be much easier, and I get cleaner results.