With a 3570k and a 7970 you will be able to max out any valve game easily, i don't know why it doesn't automatically set you to full AA and full AF but your system can handle it easily.
The CCC settings for AA and AF are for forcing them on a game which does not natively support it, have the game handle AA and AF when ever it has the option, it can choose to only perform AA and AF on the edges of the objects rather than across the entire image which allows it to reduce the performance penalty.
OK so I turned AA and AF up to the max and it runs superbly. Nice and smooth. A solid 60fps. Thanks!