Thanks guys!!! , Don't think I will downgrade RAM. 10% decrease in performance is enough for me to say "No-No". But I definitely change the PSU then.
Also I was thinking wouldnt Bulldozer be better? because mostly I would be doing Video Editing and maybe minimal gaming. I heard that Bulldozer its really good for editing because of it "shared resources in cores". But Bulldozer is inrease in price so for first build I guess I stick to that