P8 and P9 are both 32 bit apps. Your 4GB RAM will never see its full use.
PP2010 and PP2012 are both 64 bit apps.

PP2012 has all the latest, can use all your RAM, and give the best options for future upgrades.

P9 did not come with new figures.

Poser 1, 2, 3, 4, 5, 7, P8 and PPro2010, P9 and PP2012, P10 and PP2014 Game Dev
"Do not drive faster then your angel can fly"!