Studio I work for (UK localization) will be upgrading equipment soon (within 1 month most likely). So far over here only Mac were used, but because some of the software require Windows (bootcamp and virtual machine don't do the job) we need to get a few PCs (I'm the only person in the company who uses PC on daily bases).
As we might get a few PC it is likely they will be on different spec depending for whom they will be (roto artists or fluid / rendering artists). This is why budget range is so wide.
- Maya (3D animation and rendering - MentaRay)
- After Effects (including raytracing)
- Houdini (FX)
- Realflow (fluid simulation)