What makes you think you know the problem space enough to make a C implementation that you won't have to rewrite 10 times? Writing in C certainly doesn't stop any rewrites at least where I work.
This. I'm as hardcore C programmer as they come and I still find it better to start with Python and reimplement in C when the application becomes familiar and finite. It's faster, easier and cheaper.
The basic notion is that every bit of code is better the second time its written, and C development is just too slow for the first iteration.
