Good luck Bootsy
Gotta be honest here, when it comes to games Linux is poor compared to Windows.
The platform with the most games titles available is Windows although a great deal of those Windows games Titles will not play in Windows 7.
Then there's consoles. Keyboard and mouse not normally used so that rather fubars fps's.
Increasingly games makers are designing with consoles primarily in mind and then porting the games to Windows. This is not usually a good thing, especially when it comes to Save systems within games. It's rare to find a major selling game that will run natively in Linux.
Here's a taster of the sort of games available for Linux, although this dates from 2007:
http://rangit.com/software/top-8-linux-games-of-2007/
A Google search will turn up more lists.
If you like gaming I'd suggest dual booting Linux and Windows. In my opinion, frustrating as it is in some aspects, Windows on a PC is the best gaming platform.
As at this time, in my opinion, Linux cannot be taken seriously as a major gaming platform.
About the only advantage with Linux games, however, is that the majority of them are free.