I would recommend the XFX 7870 DD edition. (what im currently using) The card runs really quiet even while under load gaming. Has run every game iv thrown at it on max settings with FPS still through the roof and never dropping below 60.
This card was an awesome addition to my build and i highly urge you to get this card.
(And it looks good if you got a window in your case )
Well in amazon is still in that price(that is where i will buy everything), at the momento of the buy is still in that price i will buy, if not i will buy a corsair tx or a xfx pro or another good one a good price.
I cannot find where say that the extreme4 have ram o.o