A gaming machine is not nessesarily the best choice. Few games use more than two cores, Poser 8 can use 32 of them. A Core7 Intel is wasted in a game machine, but Poser 8 can run eight threads on it, making it a good part faster then a simple quadcore.

No need to get an really expensive graphics adapter. Good OpenGL capabilities and not ultra-cheap should be more than enough.

About the power supply - see what components are there, look how much power they need. Add a safety bonus for further expanions, and you are set. High performance graphics adapters need much power, but you don't need them for Poser. If SM spoke about "more power", I guess they refered to computing power, as in "too small cpu/not enough ram". Otherwhise it would not make sense at all.

A ship in port is safe; but that is not what ships are built for.
Sail out to sea and do new things.
-"Amazing Grace" Hopper

Avatar image of me done by Chidori.