Need A Good Mac Game For Steam

Any Suggestions?

The Witcher 2 if you can run it and I think Portal 2 is on mac and Counter Strike (not sure which one)

http://store.steampowered.com/search/?sort_by=Metascore&sort_order=DESC&category1=998&os=mac

All these games are good and run on mac. I would personally recommend them all. Give us a genre to narrow your search.

Civ.