Sound card compatibility

Hi. I am keen to buy a Mac Pro but do not have enough knowledge of sound card options. I would like to run my current PC games (dual boot to Windows) that prefer Soundblaster X-Fi. What are my options for Mac Pro sound cards (ideally that support PC games?)
Thanks, Cam

The M-Audio Revolution 5.1 or 7.1 should work. There have to be plenty more seeing the Mac Pro is great for audio editing and such. If you'll be running Windows, a Windows card should work fine, I would think.

Thanks for your help.