Two words for you: Use Bootcamp.
You are never going to get good gaming performance from a virtual machine. Boot to Windows and run it that way.
I install right now the wmware 3.1 for see... but right! bootcamp is the best solution I think BUT!!!!!!! I have fear to install... see when I try to install first appear a dialog box that say "first back up your disk" that sounds like "HEY THIS IS NOT SECURE!!!" so I have in plans to backup all my data and install from zero... (a fresh install) of snow leopard... and later install bootcamp... with fresh install...