The big difference between CT5 and CT5 Pro is that more complex and detailed facial expressions and animations can be created with Pro. The timeline is also limited in CT5 so personally if you plan on using Crazytalk 5 with iClone 3.0 for facial animation duties then I would go for Pro.
If you haven't already, take a look at the new simplified feature matrix to see the differences between the two versions.
http://www.reallusion.com/crazytalk/ct_matrix.asp
Peter EdwardsForum Moderator
iClone Daily Blog