My motherboard supports SLI but I have been hearing a lot about ATI's HD cards really kicking Nvidia's butt recently.
So the question is for about $150 USD should i get a nvidia card and do sli later (or upgrade to a new card) or just stick with one ATI HD card? sli would seem to be the best choice for future upgrades but many games do not use dual GPUs to their max so a better single card might be the way to go.
BTW, system specs are,
Phenom X4 2.8Ghz
Windows 7 Ultimate
64GB Transend SSD boot drive
1TB drive for games
i'm not saying 5770 or 5750 is a bad choice. i'm responding to the one above my comment. just because the card have DX11 and simply using GDDR5 memory it doesn't mean you're good to go with the card. you have to see performance too.