BTW Operaguy, I just built out a Core2Quad box specifically for this purpose, that's the Windows 2008 box...rocks very nicely with PoserPro.

however, consider the use of Wiindows 2008x64 vs Versus Vista x64.  Even with SP1,
vista is much slower than W2K8.    (I've been doing Vista x64 for over a year now,
before that XPx64...just started moving to W2K8 x64 servers cause it's insanely fast).

W2K8 is actually impressive (and I'm a Systems guy)  the thing knocks the socks off of
W2K3, on identical hardware, W2K8 is visibly faster.  And W2K3 feels faster than Vista.

You can optionally add the Desktop Experience component, and get a lot of the Aero interface,
the only thing I seem to be missing is the "Explorer Preview" feature, which sort of sucks,
but one can always use a third party file explorer if preview panes are important.