If you really want to do 3D, I'd recommend getting a 3D Vision monitor, sell your AMD card and get an Nvidia card. Nvidia has much better support in 3D. Not so much from Nvidia itself, but from the community. Though Nvidia's support is still better, than AMD, just not by much. However, through a mod community, many games are fixed to work flawless in 3D, where as you are alone with AMD.
Since you typically use a monitor much longer than a video card, it makes more sense to go down the route of your monitor.
Here is one mod community I know of that makes so many good games great in 3D that otherwise would suck. http://helixmod.wikispot.org/gamelist