I've had Camstudio for a couple of years, it works for basic capturing, but for serious video work the BSR is much better IMO, even if just using the free trial, no time limit, version.

There is a Camstudio Pro version for about $29.95, maybe for less on another website? with lots more features than plain Camstudio version.
Camstudio Pro

But the BSR registered version for $39.95 with movie studio has it beat by a mile. And if you upgrade to the Movie Lab later you can really do much more with the extras that it gives you.