Ooops- hadn't read this read in a few days. Guys, Nausicaa IS available in the U.S. in its manga form. It came out in single comic form many moons ago and Viz collected it into graphic novels about the same time they began to publish Ranma 1/2.

These were the editions I had bought (whick are now out of print but should be available at many comic stores):

Nausicaa Perfect Collections

And it looks as if a new publisher is currently printing volumes at $9.95 a pop:

Nausicaa Vol. 1 on Amazon.Com