Poser 7 should work much better on the Intel machine than on the G4. I had it on a G4 and it was pretty non functional but it runs smoothly on my new machine (but I am not sure about 10.5).

The easiest thing for the materials is this.
Set it up how you like, to to the material room, In there there will be a plus, on the bottom of the library area, click that, tell it material collection versus single material save it. That should be good for P6 and P7. For P5 you have to do a couple of tiny edits in a text editor. Change mtlcollection to figure and change Poser 7 to Poser 5, change the extension to Pz2.

For the poses, I am not sure. I haven't done much with V4. If they are the ones that come more baselike they should apply with a morph pose but I am not sure.