Hmm...
I have few movies on my YT profile. One made with Windows Movie Maker (http://www.youtube.com/watch?v=NTbBLFadHO8), the others were made using SONY Vegas 9.0 PRO (for example this one: http://www.youtube.com/watch?v=xGpMYCdhFCY). Both were filmed using FRAPS and made on the same PC. Only editing software were different.
Sindragosa's movie weights 460 MB (after editing). Raw file size was about 15-20 GB as far as I remember.
I'm not any codec spec-master so can't help You with that.