If you do not have a PlayStation 3 system, my recommendation is to buy a PlayStation Move bundle. You will then have a complete game system that not only allows you to enjoy the existing PlayStation 3 games, but also lets you control the action. This package comes with the PlayStation 3 console, PlayStation Eye, Wireless Controller, PlayStation Move motion controller and sports games.
Since this new system comes out just before the holidays, and if you have any interest at all, my recommendation is to buy it as soon as possible.