I do love my Mac, but a Windows machine at home will be good for gaming, 3D dev work and many other things. The pricing available through the uni is so good, I am going with the HP 8730W mobile workstation. It is a pretty nice piece of kit, for the price it is stunning.
My plan is to run Windows7 on it actually, with Vista drivers to start with, though there are more and more Windows7 drivers as well.
[image of the HP 8730W via the HP site]