I have the Proteus Pack sounds for Kontakt, and I also have the Proteus 2000 for Dim Pro - couldn't tell you why I did that.
I generally use Kontakt over Dimension Pro, but Dim Pro works fine - and in any case that was not your question.
I don't have much (any) use for Mo Phatt, but there are still SO many usable sounds in the larger Proteus Pack that I would recommend you spend the extra money for it. It is still so reasonable for all of those sounds.
Anyways, that's my recommendation for you. :)
Bob Bone