What is the best computer

What is the best computer to get for using toon boom? I am looking to upgrade my system I am currently using a e-mac 1.25 and 1gig of ram. But making cutout characters with allot of pivot points is very taxing on my cpu. I am looking at either a 20” i-mac g5 2.0 or a duel processor g5 2.0 but wonder if toon boom is duel processor aware or not.

Also is a fast pc better than a mac for this kind of work I will have one built for just animating on if that is the case I just would like to find out what the best possible specs are?

Please any input wold be greatly appreciated ???