I also mainly use GPO, and GVI as a plugin to run things like GOS and SAM Brass for orchestral stuff. Been getting Computer Music Magazine a lot lately for dance music, as they give out loads of great samples every month. Not to mention a host of random VSTis and plugins.
Proud to say my home gear is PC!
As I teach Music Technology, I use Macs a lot too, mainly using Logic Pro 7, Reason 2.5, Sibelius 4 and 5. We've also got there things like the VSL Chamber Strings.

