I've gone the AMD route and i must say its VERY nice for gaming! From the outset the purpose for my upgrades was mailny for gaming @ 1080p on high or ultra and I'm very happy with what I got.
Rig:
FX8350 still running stock speeds (for now

) paid R2600 at the time
CM Hyper 212 Evo R389
Asus M5A99FX Pro R2.0 paid R2223
4x2gb (8gb) Samsung Low Profile 1333Mhz ram (Brand new I scored free off a friend that I did a huge favor for

)
Ocz Vertex 2 100gb SSD (did a trade on Carbonite forum for it)
PowerColor Turbo Duo R9 280X R3799 Wootware at the time and skyrocketed since!
The rest like case, psu etc. I had already...
Here's a little vid of a replay of mine on Grid2
This is on a Sony Bravia 40" lcd @ 1080p on Ultra 4xaa on which I'm getting on avarage between 55 - 65 fps. On 2xAA it goes up 75 fps!
Excuse the quality of the vid as this was shot with my now exctinct Nokia 701 lmao! In reality it looks waaay better!