I have P1,2,4,5...no Pro Pack...buy P5 As someone else mentioned above, but perhaps hidden a bit...PRO PACK is an ADDON to P4...so you have to buy both. The Pro Pack features are included in P5, other than the plugins to export your Poser work to 3DMax and Lightwave, and I believe those are being worked on for P5. P5 has a lot more to offer than P4, even with the problems, and the problems are being fixed. P4 has numerous bugs and problems as well. I still have P4 on my system, but have not used it since installing P5. Check that amazon price and save yourself some money....unless you can pick up P4 at Ebay or something. Another option not mentioned..P3 is being given away free on several magazine CDs...it is a big step back, but much of the concepts are the same, although not nearly as good end result as P4 or P5, but it may give you an idea of what the product is all about.

Humankind has not woven the web of life. We are but one thread within it.
Whatever we do to the web, we do to ourselves. All things are bound together.
All things connect......Chief Seattle, 1854