STOP,,, Save your Money!
I have put a lot of time into trying various burning methods,,,
Best combo I have found is
DVD Decryptor -- FREE
CLONEDVD -- not so free
DVDSHRINK is a great freebee too,, for compression,, however,,
Decryptor will make your DVD "backup" region free,, Simply point to the file ,, choose File mode,, get your vobs,,
Run Cloned DVD,, automatically sets your compression for best quality picture,, take out the extra languages,, write your ISO,,
Back into Decryptor,, Choose your ISO,, change your Mode to ISO Write,, Burn your "backup" DVD,,
that easy,,
Most important is not to use Crappy Media,, buy half decent manufactured Blank dvd,, Ritek, even Sony is ok,, but not Princo,,
Once you have a good ISO,, delete your vobs to get your space back,, now you can burn multiple copies,,,
For more info,, here is a GREAT GREAT site for all the pointers,,
http://www.dvdrhelp.com
cheers