I had a friend with iFinish, he tried to upgrade his pc with iFinish and attempted to get an HP (an xw4200 i believe) and run iFinish. The software seemed to install fine, board passed diags, but he could not get any video playback on his desk-top. He was able to play out to his video monitor, but not to his desk top…
If I were you and NEEDED a solution that will definately work, I’d get the last approved machine if I could get my hands on it.
Or cross over to a G4 (or one of the new mac media 100s).
My $.02
~A.D.