I had this really long post about my DivX movies that I will make, but I just want to know if these two are good choices, for low-end (modem download) and high end (cable/dsl/lan download).

Low End:
128kbps Stereo Media
500kbps DivX High-Motion
400x225

30 minutes is...
137mb

High End:
256kbps Stereo Media
1600kbps DivX High-Motion
800x450

30 minutes is...
407mb