What components should I get?

[Yuhaney]

Personally, I will never again buy AMD processor after I get rid of my current one.

There might be some good ones that are pretty powerful, but for my own bad experience with these relating to the news and video / picture comparison to Intel, I've decided to move over to their products in the future.

@ Lucke
Games are mostly runned through your GPU and CPU is most likely the component to bottleneck your graphics card. But in this case, I'd say that the GPU ain't so powerful that it would be bottlenecked alot by CPU you happen to choose.

However, if you're really sure that you won't be playing anything else than the games you mentioned, I'd suggest that you go with the Phenom II X4. Should be more than enough. Just make sure to check that the socket is correct in the motherboard! Otherwise you're going to waste some money for nothing.
Also lot of reviewers seem to have some sort of problems with their Bulldozer which makes me turn to Phenom X4 II...

Plus as BlueFury said, make sure that you use Google Chrome. It is currently the fastest browser out there (based on tests I saw few months back).