If on the subject of DVD making I suggest FAVC. It acts as a frontend to HCenc/QuEnc and loads of other highly respected tools and best of all it is free.
See the little bit on it I wrote for the TV shows thread and post somewhere if you need help (my PM box may fill up by the end of the day so that may not be the best route):
http://gbatemp.net/index.php?showtopic=64975&st=0
900MHz (and I assume there is not too much ram either) is less than brilliant but if you drop some options (and you will not really notice the difference (especially on a portable) unless you train yourself and know what to look for.)