clmlbx, currently there is no such compatibility issues with AMD drivers and they are as much stable as the Nvidia drivers. I know not before long time, AMD cards used to suffer from poor driver support but right now they've improved a lot and are on the same level of their competitors.
And regarding rendering, AMD cards do have support APP (previously known as ATI Stream), AMD equivalent of CUDA, which is supported by most of the rendering software like 3D Studio MAX, Maya, all the adobe products and they also offer nice speed up.