[willndmb]

i have a mac and i have/worked with iMovie 2 -- had 3 and 4 but for dubbing they suck
iMovie HD which i hate and wish i hadn't trashed iMovie 4 for it -- because it will not open a older project without converting it and screwing it up
FC Express
FC Pro 3 and 4
DVD Studio Pro 1 and 2
iDVD 5

iMovie 2 is the best iMovie for dubbing because it lets you move frame by frame
FC express is a low scale version of Pro--for the most part Pro is over kill
Pro comes with Shake though, never used it
DVDSP 1 is cool but 2 killlls it, 2 has menus built in, the rest is basically the same i think
iDVD 5 has new menus and allows you to do chapters but it usually hasa fixed bit rate

FCE/P HD i never worked with but based on iMovie HD its the same as thenormal version just tweaked to work with HD video too

so all in all
if you want to do dubbing right now the best bet would be to get FCE/P
depending on what youuse to burn iDVD will work
or DVDSP will--and thats wayyy better
if you don't do dubbing that has to be exact like concerts then iMovie is fine and FCE/P you would prob only use for mixing angles

EDIT-- FCE/P isa lot like premiere