It depends heavily on what you want to do??

Do the figures move in your game?

Poser figures are real resource hungry. hence, Poser itself has a good CPU and RAM apetite.
It would be wise to make a good game plan. (and I do not mean a plan of the game) but rather the workflow plan to get where you want to go.

It can take from minutes to hours do render one single frame as you see them in the gallery.

But then, If you worked with DAZ Studio you know this already.

Poser 8 and PoserPro2010 (as all versions before)  have figures and some basic clothes in the content, but, you certainly will have to buy, (or make) stuff.

all depends on what you want to achieve.

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"!