I run a pc and vista at home. I game mostly
At work I use a Mac Pro 8xcore, Inside that i run vmware fusion with a exact image of my work laptop. I find that setup way more stable then straight windows box. I can also backup my work file to a External and open the image at home.
Macs are expensive thought and as a geek my personal laptop is a Dell Inspiron 1505.
T7250
8600gt
I can game on it and run lots of shit.