The brands I like are Sapphire, ASUS, MSI and XFX. Get the one that is cheapest. Yes your motherboard will support NVidia graphics card fine (In fact your motherboard's chipset is from NVidia). But at this price tag, NVidia is a little bit behind.
Though i want to go with radeon 6850 but i'm thinking of buying 6790 or gtx 550ti along with 500watt psu,Both will come with the 6850 price
..I'm confused between these two,Which one is the best ?
I'm also looking for low power consumption graphic card.? Any suggestion ?