Abraham, do you use the 64bit version of Vue? It's supposed to handle those hi res textures better.
Did both of you import the pz3 as single mesh, so that it loads the necessary textures only once, and not for each body part?
I'm asking because this is what I always do, and I have no problem importing on my aging machine with only 1 gig of RAM. Even reposing works, even if slowly.