+1 for downgrade your proc to 2500k
I would choose these GPU types:
HD6850, HD6870 or HD6950 (budget dependent)
GTX560 or GTX560Ti (budget dependent)
HD6970, GTX570, GTX580 and so on are more expensive, usually I do not aim for this class but it is still your choice.
Lower than HD6850/GTX560 is a no for gamers
ASUS, Gigabyte, Shappire, XFX, MSI, HIS, EVGA, Club3D, Sparkle, Zotac
I would get Corsair, Tagan, Silverstone, Antec, Enermax or Seasonic better than OCZ for my PSU