Thinking of going back from P5/SR4 to SR3, at least I knew all of the bugs and what to expect, and I will trade a bit of instability for much faster rendertimes.

As regards what OS to use, Win 2k Pro Sr3 not SR4, as 4 seems to be buggy. What is it about SR4's??
I still think Win 2k Pro is the best OS Gatesville ever produced.