I think neither Combustion or Shake are actually editing apps...
You can wait for Premiere Pro (WIndows XP only!) - looks promising...
My favourite is Vegas Video, even though it doesn't support DivX import (but it's possible to render in whatever format you want).
It also comes bundled with one of the best MPEG (1+2) encoders (MainConcept).
Take a look here
There is also a special version with a pretty nifty DVD authoring module included (a bit on the pricey side, though).
It's called Vages+DVD
Over and out...
Subdivide and conquer!
Free your mind, and your ass will follow!