Aw man, you called the new mac slow?
Right now it is faster than the fastest PC out there according to Apple when they had an independent company test the two fastest - a Dell and the new Mac G5. Since they had to equalize the tests - they didn't even put the entire amount of RAM in the Mac that it can use. They limited to 2 gigs. Here is the benchmarks from Veritest.
As for iMovie, I stand corrected. You are right, I was thinking of Final Cut Pro.
And I never suggested you buy a Mac for this, just use one from a friend. Sorry I offended.
(I used to be a Wintel user - you don't need to tell me I am ebil)