To be honest Linux gaming is frequently more trouble that it's worth. Only ID and UT have really made any effort towards expanding gaming on our preferred platform. They do this not out of the kindness of their hearts or any ideological reasons but, rather, becasue their games (up until now) are written for the OpenGL graphics API which makes porting to Linux and Mac a heck of a lot easier than porting competing games coded for Direct3D.
If gaming is a high priority on your list it might be worth the trouble to keep a small Windows partition for the purpose of dual booting.