Get USB 3 too.
Windows 7 Readyboost on USB and "fast" SD's or sticks can make your system VERY fast.
8GB RAM, and some readyboost sticks.

I have 6B Ram  now , one SD card and 2 USB sticks on readyboost.
Did not have a problem yet.

Happy Posering
PS, you"ll love Poser Pro 2012

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"!