I use 3dsmax. Got a copy from school. >:0)
I'm no good at it yet though. I'm still trying to learn how to build models from barebones vertex tracing, instead of shapes that are to be altered.
I just really like the quality of it.
I use Milkshape too, though. hehe.
What abotu Gmax? it's free, and it's basically 3dsmax too, isn't it?