I'm looking for a graphics card for my computer and I'm leaning towards SAPPHIRE cards. However I don't precisely know much of the differences between graphics cards so I was hoping someone could assist me with choosing a card. Budget is between $100 and $200. Monitor is 1920x1080p, for gaming and PSU is going to be 650W Corsair. On Newegg.com there is a 6870 HD SAPPHIRE for $169.99 but on a website with computer parts in my country there is a SAPPHIRE 7770 for $143AUD. Which of these would be the better choice for this computer I'm planning to build. This is the last piece that I need confirmed before I can get it for my birthday. Thanks the links are below.