CamStudio File Compression?

What video compressor would you recommend using when recording video tutorials for blender (maximum time of 15 minutes per video). My goal is to keep the file size under 1 GB, but I’m not sure that’s possible without completely messing up the quality.

for the program ‘camstudio’ use the flash compression option which comes with it. it takes awhile to encode the file for some reason, but it does a fantastic job, and the resulting output is both crisp, and small in size.