Fast processor
Lots of memory
Big hard drive
External hard drives (for file storage)

And you don't need a high end graphic card for Poser.  Save yourself several hundred dollars and buy a cheap card. That's all you need.

"It is good to see ourselves as others see us. Try as we may, we are never
able to know ourselves fully as we are, especially the evil side of us.
This we can do only if we are not angry with our critics but will take in good
heart whatever they might have to say." - Ghandi